Every liberal does it too, from center right radlibs to far-right “conservatives”: the most extreme right fringe liberals hate the mainstream liberals for not being bigoted enough, the mainstream libs hate the radlibs for not being cruel enough, and the radlibs hate the left for not being chauvinist enough.
Denouncing chauvinism in particular is like a liberal moral event horizon, a cardinal sin against their self-interested belief in the righteousness of the imperial hegemon that keeps the treats flowing at gunpoint.
I won’t at all deny that society has historically been a lot more hostile to vegans than vice versa. I grew up a vegetarian me whole life and that got enough of that unwarranted abuse as it is. But I’ll be honest, in my personal experience, I’ve met about a hundred vegans who weren’t bothered to talk about it (but were frequently harassed by others for their veganism anyway), five vegans scream abuse at me, and between zero and one who wanted to engage in a conversation or saw me as someone to be convinced. I just think it’s a different kettle of fish.