It's been a while since I've encountered it, which is why I wasn't totally sure of the usage

But anecdotally, the handful of times I have seen the term in the wild, it was always from someone inserting themselves into a conversation where obviously people aren't going to be open to hearing about veganism.

Like if they hopped into a thread about, for example, a BBQ or hunting forum, and started berating people for eating meat, and when they get told to pound sand, they go off about how that's "typical carnist behavior" or something.

Which I think you can probably agree is pretty CHUD-y

Not saying that's how it's used in regular vegan circles, but that's how I've personally seen used it as a non-vegan