He regularly mocks ANYONE who attacks him, regardless of race, ethnicity, or gender. This isn't how I'd go about being President, but let's be real about context here.
Lebron James relentlessly attacks Trump. He's getting the pushback Trump gives everyone who opposes him. Part of equality means that when you step into political arenas, you take on flak just like a white male would. Truthfully, I can't think of an example of someone who Trump has flamed in a Tweet that was someone who was sincerely offering some kind of olive branch. He flames his enemies; people who wish him ill. A moral argument can be made that Trump should be "bigger" than this. A practical argument is that the political graveyard is full of "bigger" folks. Trump's about "winning". This sort of sets the course, does it not? People can make up their own minds about this at the ballot box.
How about it's just wrong and disgusting what he said, regardless of what they may have said about him...
or whether he's done this before...
or whether he's President or not...?
