Idk, I have the opposite perspective. In real life, I hear of far too many announcements about being vegan when food isn't even being discussed (e.g. "Hi, I'm and I'm vegan."), and I pretty much only hear about someone being anti-vegan when someone is being obnoxious. This is much worse on the internet, where people's inhibitions seem a lot lower than real life.

In fact, the only obnoxious anti-vegans I've seen are responses to obnoxious vegans. As in, the discussion is started by the vegan, and then they get dogpiled by the anti-vegans. The number of responses may be higher from the anti-vegans, but anti-vegans don't seem to initiate.

Maybe that's just me, idk, but that's what I've noticed.