It comes from the continual attacks by science on people of faith. We are constantly told that if we do agree with them then we must be flat earthers. That action can only be taken by those who think their statements are beyond question.
I recall years ago science told us that if we did not believe the universe was 12 billion years old, then we were ignorant.
Then they changed it to 13 billion... and then we were ignorant again.
Then they changed it to 13.4 billion, and yes once again we were all ignorant.
Then there were the bones found in England that proved there was a missing link, and if you disagreed... you were ignorant of the facts and a flat earther.
Opps.... turned out to be a hoax. But we were still ignorant anyways.
Then there was the missing link in China... and if you disagreed you were ignorant and a flat earther...
Opps.... turned out to be a pig tooth.
And of course we were all still ignorant anyways,
I suppose this post will prove I am ignorant and a flat earther.
What you actually seem ignorant of is history. Do more research on what scientists themselves were actually saying when these episodes occurred. Don't believe non-scientists who throw around "science says that..." because often they are wrong.
To look at your points:
"I recall years ago science told us that if we did not believe the universe was 12 billion years old, then we were ignorant."
First, unless you are considerably older than I am (say a centenarian) you don't "recall" that at all. You heard that it was once claimed the universe was 12 billion years old. Actually the first estimate of the age of the universe was "from 12-20 billion years old" but your source didn't tell you that, did it? Since then, further study has provided more accurate estimates. Even the current estimate is not actually 13.7 but a range of which 13.7 is the average. It is considered to be accurate within 1%.
Second, science never asked anyone to "believe" an age of the universe. Scientists told us what they calculated the age of the universe to be. You are welcome to check their math.
"Then there were the bones found in England that proved there was a missing link, and if you disagreed... you were ignorant of the facts and a flat earther."
Piltdown man. Have you read the Wikipedia article on that?
Piltdown Man - Wikipedia, the free encyclopedia Note that it was always scientifically controversial and that the first suggestion it was actually a compound of a human skull with an ape jaw came as early as 1913.
"Then there was the missing link in China... and if you disagreed you were ignorant and a flat earther..."
I don't know to what extent "missing link" was used by scientists. It is a bad term and has not been used scientifically for many decades. Though journalists still seem to like it. It shows an ignorance of current understanding of the history of evolution to refer to a missing link. Species are connected through common ancestry, as on a family tree spreading out onto different branches, not as chronological links on a chain.
I suppose you are referring to Peking man, which is a genuine
Homo erectus fossil. Fossils of the same type have been found all over the Old World now.
Homo erectus - Wikipedia, the free encyclopedia The evidence indicates they are the common ancestor of several more recent species, including our own.
If you disagree with that conclusion, you need either to establish the scientific basis of that conclusion or grant that your disagreement is not based in science at all.
"Opps.... turned out to be a pig tooth."
Oh, looks like you have got your stories confused. The pig tooth was not found in China. It was found in Nebraska. You can read the whole story on Wikipedia.
Nebraska Man - Wikipedia, the free encyclopedia Note that there was never complete acceptance of the human connections of Nebraska Man in the scientific community.
So we have a hoax (Piltdown Man), a case of mistaken identity (Nebraska Man) and a genuine hominin fossil (Peking Man). In the case of the first two, there was controversy in the scientific community from the beginning, so I very much doubt anyone was told it was ignorant of them not to accept it. Why would scientist call on non-scientists to accept what many of them did not themselves? Furthermore, one of these cases is more than a century old and the other nearly a century old. Seems at the very least that scientists have learned to base their conclusions on well-checked facts, not dreams.
So, it behoves the "skeptics" to be at least as well-informed.
"And of course we were all still ignorant anyways,"
We are all ignorant until we take the time to learn. Every scientist was once an ignorant child. It is the assumption of the right to be skeptical while refusing to take the time to learn the facts that riles scientists. Even that could be tolerated if the forces of willfull ignorance were not campaigning to have their views be part of school curricula. But can you really blame scientists for their response when they see a mangling of their life's work promoted for science students?
A farmer would have the same reaction (and rightly so) if a teenager from an urban ghetto tried to teach him how to farm and was getting it all wrong. Even more so, if the teenager's ideas were being seriously proposed as national agricultural policy. A Christian would have the same reaction (and rightly so) when a non-Christian who has never read the bible and knows as much about the faith as he learned from the Simpsons gets all the basics of Christianity wrong and on that basis claims it should be suppressed by society.
Scientists are not infallible and don't claim to be. They don't ask people to "believe" scientific conclusions, but they do ask that if those conclusions seem wrong to you that you follow the same trail of evidence to come to different conclusions. In short, until you do your homework, you don't have the right to have your "skepticism" taken seriously any more than the urban teenager has a right to be taken seriously by the farmer or the non-Christian who hasn't even read the bible to be taken seriously by Christian teachers.
Scientists make mistakes often, but it is also scientists, not willfully ignorant "skeptics", who correct those mistakes--through further study of the evidence.
I don't think you will find scientists arrogant toward people of faith generally. After all, many people of faith are scientists. And many people of faith don't want to see science corrupted in the name of faith.
Nor am I saying scientists are never arrogant. Some are. It is a habit with certain people. They are even arrogant toward other scientists. In fact, to hear them, scientists often see themselves as a fractious lot with one scientist dissing another and vice versa.
But don't discount that the naming of ignorance may be deserved. Check out what the "ignorant" one is saying before assuming their intellectual superiority. Scientists are not necessarily more intelligent than their detractors, but they have spend a good many years learning science. That has to count for something.