It may be because the word has now become the universal insult word, having passed from having a particular meaning--and certainly not the original meaning--and become instead just something that is said to really, really smear anyone for almost any reason.
That can be dangerous, don't you think? Labeling someone as "racist" which is very condescending and a huge slam to their character... when they are not "racist". They are prejudiced to the actions of a certain religious group.
Now, for me, I work with Muslims... nice people. We get along just fine and I have absolutely no concern about what God or god you want to worship or how you worship...
I could care less what religion you are or how your particular sect of a certain religion believe.
BUT... start killing people or insulting people or hurting them in any way... for any reason or under the name of your god or religion... is wrong .........no matter what your excuse..
So, in the end, people are wary of people of the Muslim religion simply due to the track record of people doing things based on their view of that religion.
It is not racism... it is a learned fear. A learned and cultivated instinctive protective reaction.
A small number of deranged people use a certain religion as a springboard and justification of terrible acts.... It's wrong... But the fact that people are cautious is a natural and protective reaction.
We should not be insulted because of this.
If someone was to go out and kill a bunch of random people... and claim that Jesus told them to... the whole of the Christian religious followers would be strong, loud and vocal that this is totally against Christ's way..
I would like to see more of that from the leaders of Muslims... I think, that they too are afraid of being in danger of doing so, however.
Sorry for being off topic.