"Trump's a racist!"
That's not what he said. In fact, I'm pretty sure that every time you've uttered that phrase in this thread, you were responding to an argument that was in reality far more nuanced. In this case, what Obama was criticizing was Trump's opposition to "our progress," apparently represented by tolerance, democracy, justice, good schools, and ending mass incarceration. That's so vague it could have been said by any politician. Disagree with it all you want, but it's far from whatever cynical alt-right buzzword you're describing it as.
But hey, speaking of racism, it's funny to see birtherism
back in the news. Trump's been claiming that Hillary was the one who started the birther nuts off, and that he was the one who put it to rest by getting
Obama the state of Hawaii to release his long-form birth certificate back in 2011. Both of those claims are blatantly false, and the latter is especially easy to debunk from looking at the many tweets he's posted since he supposedly resolved the issue continuing to express skepticism (the article posts a few of them, here's
another). Trump doesn't consider the matter closed at all. He'd bring it back up again in an instant if he felt it was to his advantage, and his supporters would simply ignore his inconsistency, just like they're currently ignoring his inconsistency on whether he's positive or neutral (not even negative, just neutral!) about Putin. No, Trump isn't a racist. He just likes to use racists as his base.