Because they are racist. Don't you get it yet? It doesn't matter if they support trump, many of his supporters hate anyone who isn't white or Christian
AS A TRUMP SUPPORTER, I IDENTIFY AS SOMEONE WHO'S NOT A RACIST, MISOGYNIST OR HOMOPHOBE EVEN THOUGH I SAY A LOT OF RACIST, MISOGYNIST AND HOMOPHOBIC THINGS; AND IF YOU DON'T RESPECT MY IDENTITY, YOU ARE BEING A HATEFUL BIGOT AND MISIDENTIFYING ME