I'm sure the dickhead thought he was being funny, but what in the hell put that thought in his head to begin with? Someone calls you a racist, and your first thought was to yell something racist? Get out of here with that shit.
Trump retweeted it because he had the same fucking thought. He probably thought it was funny and of course he loved it that those turds where having their little Trump parade. There is no limit to his narcissism. So he is willing to do anything to feed it. Sad!