The appropriate question would be," Why are Christians disliked?"
Considering Freedom From Religion Foundation has pushed to take the 10 Commandments from the Court-House, pushing to remove In God We Trust off the money, pushing to...well basically take away our faith. 100% of FFRF members are Atheists.
Now personally I don't like nor dislike Atheists. I have several friends who I socialize with that are Atheists. We have a mutual understanding of what we each believe and we do not fight over it. But those such as members of the FFRF who are trying to push for persecution...well I can see why people would dislike them. Imagine if there was a FFFF Freedom From Fools Foundation(Psalms 14:1) pushing an agenda to eradicate all philosophies and science from schools. It'll [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse] you off wouldn't it?