Really, the moment you say "I support Trump" you lose my vote regardless of race/sex/orientation
And no one's saying you aren't allowed that stance. Just that if you're going to claim elsewhere that only minorities can decide who is or isn't racist, you might want to back the fuck down crying "racism" over something that one is saying is not racist. In fact, if you really want to be true to what you claim, you should probably avoid the subject altogether and let minorities - y'kno, the people you think are actually authorized to speak about the subject - discuss it instead.
Of course, you won't, because your real problem isn't with non-minorities speaking on the subject, it's with people who disagree with you speaking on the subject. You simply use the "only minorities can talk about it" line as an excuse based on your (very incorrect) worldview that most white people disagree and most minorities agree with you.