I can't tell if people who make "Make Blank Great Again" memes are Trump supporters, or are being ironic. I could care less either way, but it does make me curious.
Most are being ironic, especially since most people without originality(so like more than half the internet) love to jump on the hot meme of the moment. Trump supporters are more likely instead on newsites or reddit whining about whatever social group they feel they aren't part of.