Shout them down in every space, make them embarrased to think the stupid shit they think.
If we don't embarrass and correct them now we will have to kill them later when they come for our friends and families.
I'm not suggesting that as a whole "one Nazi makes something in the genre, and now the genre is ruined".
However, if you're not a Nazi, it would be prudent to establish whether or not the creator, (regardless of genre or medium) is also not a Nazi. Especially if that medium/genre has a reputation for attracting that type of crowd.