This is chilling to more than just tourists. I have friends who are Mexican nationals who now have to consider any meme on their phone before their way back to the States after visiting home.
My last border crossing, a few days ago: "What was the purpose of your travel? ... What are you bringing back with you? ... Welcome home." Took one minute.
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.