You get enough reactionaries asking you “you think you’re better than me?” and eventually the temptation will be to answer “sure fuck it yes I am”.

Well, that's what veganism is, isn't it? People who are morally better than others.

If they could just lead by example and shut up about it, they'd be a lot more effective. But no, they have to tell everyone how superior they are, and in a (supposedly) egalitarian society that's going to rile a lot of people up, even people who would usually be on your side.