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.
I've definetly heard plenty of people making fun of or discriminating against others with dietary restrictions due to their religions. Hell I've also heard people making fun of others with lactose intolerance or celiac disease...
We can and should strive for better, but sometimes people can just be terrible 🫤
Pardon my ignorance, what is a "matrix space"? Searching online I only find stuff about linear algebra and I don't know how many gay numbers can be found in vectors