Dude...google "worst ump in baseball". Every article will be about Angel. This is no mere hyperbole, quite literally every piece will lead with Hernandez. In addition to him being statistically the worst or amongst the very worst, you can find dozens of videos of him missing calls by a comically large margin, and I'm not talking strictly balls and strikes. He misses all kinds of calls, regardless of assignment, and is then eager to throw out anyone who challenges him.
To accuse the whole baseball world of being racist against him is so patently absurd that I can't believe that anyone would choose that hill to die on.