As you’ve said, this is all anecdotal, but I’d guess that non-vegan non-muslim non-jewish people most often have to “deal with” vegans as opposed to the other two. A quick search says that in the US there are more vegans than muslim and jewish people combined (without even including vegetarians, which definetly get lumped in the same group). Also, there are definetly other kinds of discrimination against the religious groups going on, so maybe their dietary restrictions doesn’t exactly top the list of things to “meme” about.

I’m definetly not saying that vegans are wrong or that they deserve the amounts of “jokes” on them on, far from it, I just wanted to share my experience with “jokes” in very bad taste.