You have to remember that in their twisted vision of reality the handful of times Obama addressed issues of race honestly but in a measured tone was the same as Lous Farrkahn speaking on the subject and just as militant. Somehow his statement about Trayvon Martin or Henry Gates' arrest was the same as shouting "kill whitey" from the presidential lectern. In other words, the usual obtuse silliness. But even more... They think that somehow Obama's occasional public statements on race justify Trump's obvious demagoguery. It's literally every single time it's brought up in some article a supporter in the comments uses Obama to justify Trump's heated rhetoric. It's honestly astonishing this disconnect from reality.
There's a group that thinks any racial conversations automatically equal anti-white people. Like when black lives matter started. They became offended, swearing black lives matter = white lives don't matter.
Which was always an obviously wrong conclusion. Black lives matter rose up in the middle of several deaths of black people by police officers, some on tape. Some very obviously unjust. It was saying, "We're being unjustly killed, we matter too! We deserve to live as much as anyone else!" It was never saying any other race didn't deserve to live.
So just like you said Krypton, it was an extreme warp of reality. What they wanted to hear was black people foaming at the mouth yelling for white people to die, and that's what they heard. The first time looters mixed in with BLM peaceful protesters, they instantly became labeled as home grown terrorists by this same group.
They don't want to listen to well reasoned, articulate arguments on race. They don't want counterpoints. They want a villain they can point at to dodge, or pretend racism doesn't exist. Or a villain that makes them more in danger than the minorities they say have no hardships.
In the here, and now, Trump feeds those feelings. That the white supremacists at that rally were possibly more peaceful than the counter protesters. That all Mexican immigrants are dangerous sub humans. That all Muslims are terrorists that shouldn't be allowed in the country. Trump gives them winks and nods that give them cover, and ammunition.