I love vegans. A few of my friends are vegan. There are two things some vegans will say which boil my piss, however. First is that they have a moral high ground because they don't eat animals. This isn't a given, it's a complex and nuanced argument I'd happily partake in if the other party weren't approaching it with a top-down belief that they're already in the right.
Second is the notion that we should all be vegan to save the planet from climate apocalypse. I don't want this comment to get too long, but I have multiple problems with this faulty line of reasoning, and it muddies the waters. The only likely effect of it is that less progress is made on stopping global heating. So the upshot is that these people are literally sacrificing the ecosystem they purport to care about in order to bang their drum. Fuck that.