What did Donald Trump do today?

He publicly uninvited the NBA champions from a White House visit.

This morning's Trump Twitter tirade included this message for Stephen Curry and the Golden State Warriors:

Going to the White House is considered a great honor for a championship team.Stephen Curry is hesitating,therefore invitation is withdrawn!

— Donald J. Trump (@realDonaldTrump) September 23, 2017

But as LeBron James--whose Cleveland Cavaliers were defeated by the Warriors in this summer's NBA finals--pointed out, Curry had moved past "hesitation" months ago.

U bum @StephenCurry30 already said he ain't going! So therefore ain't no invite. Going to White House was a great honor until you showed up!

— LeBron James (@KingJames) September 23, 2017

This is at least the third time in two weeks that Trump has picked a fight with an African-American figure in the sports world. Last night, referring to "that son of a bitch" Colin Kaepernick and other NFL players who have knelt during the national anthem as a protest against police violence, Trump called for them to be fired. And he had ESPN anchor Jemele Hill, who called him a white supremacist, denounced from the White House podium last week.

Why does this matter?

• Presidents cannot force people to be "honored" by their presence.

• A need for constant praise (or "honor") from others is a symptom of narcissistic personality disorder, a serious mental health disorder.

• One way to avoid being labeled a white supremacist is to be able to tolerate criticism from non-whites.