A big share of black males are Trump supporters, going by older surveys I’ve seen. Could be reflecting that.

There’s got to be some complexity behind that (and there are articles on it), but one theory I’ve heard is that many feel “abandoned” by the establishment like, say, young males (who also skew more Trumpy than 30+). Maybe social media usage is a factor too? Keep in mind the public knows Trump as the anti establishment candidate.