Maybe it’s not a “core” leftist issue but it’s a real issue.

Thats my point. Its so far down the list, you’d have to find leftist extremists that would put it at the top of their list. The meme is painting it that its a mainstream left issue where it isn’t, and I think the conservatives that made it know that too and that could be their joke. As in, there’s a kernel of truth to it, but only that. Without the kernel of truth the joke wouldn’t be funny.