I mean, sure lots of atheists are assholes. But many of us were raised religious. For sure I know more atheists raised religious than I know religious folks raised atheist. Either way folks should just let folks make up their own minds

The term for this is "the euphemism treadmill". Basically every word we have for someone being unintelligent was at one point a medical term and for 100s or 1000s of years human beings have been making the same lame joke with whatever the current word is. We can get mad at people for doing it, but history shows it's guaranteed to happen anyway.