You know, a Trayvon Martin halloween costume is in poor taste either with or without blackface, because he was a 17 year old boy who didn't have to die, and the events of and after his death caused lots of anguish for his family and many who identified with his situation. Is there a lot of racism surrounding this? Yes. But let's not forget that most of the "racism" concern was artificially injected by a media and "Race tension industry" that was eager to whitewash a latino and tamper with evidence to better fit the narrative they wanted. Yes, racism is a problem, and it's worse than it was 10 years ago - a great deal thanks to those who claim to be fighting it hardest.
It also always makes me shake my head how I'm willing to discuss any topic with any person, from the most syrupy Kags to the most Charlie Charlie, no matter how abhorrent I may find someone's opinion. But there's just always people who just can't deal with opinions and mindsets that don't exactly match theirs and shut down communication. Ironically these are also most often those who preach tolerance and openness (and consider themselves the most tolerant and open), but the actions don't suit the words. The "there's no reasoning with them, so why even try" crowd has always been present throughout history, and they make an excellent source of footsoldiery to bolster the ranks of those who have done the most harm to their fellow man.
But take heart, Bowie, you might refuse to engage me, for whatever phoney baloney reason, but I'll always be open to engage you.