Legally they should, especially if those memes are anti-American. They are subject to immigration law, which is constitutional. We are so nice to non-citizens

Legally they should, especially if those memes are anti-American. They are subject to immigration law, which is constitutional. We are so nice to non-citizens in America that many of them actually do think they are legally a citizen's equal, except for voting rights. (I used to think that myself.) They are not.