"You're starting to sound like a separtist."
This is for when certain ideas are, rightly or wrongly, associated with a particular group that is popularly opposed, in turn creating a stigma against expressing said opinions.
Those supporting such stigmas are like McCarthyists.
Note that this isn't just overgeneralizing, it's also Ad Hominem
; instead of rebutalling on the points, it rebutalls based on WHO the points are associated with.