What did Donald Trump do today?

He summoned representatives of the five major news networks to angrily complain about their coverage of him.

In what one witness called a "f--king firing squad," Trump reportedly dressed down the media representatives for several hours over what he felt were unfair portrayals and other slights during the campaign.

Why should this matter to me? 

• This probably won't help convince anyone that media reports of Trump being thin-skinned, easily angered and prone to holding grudges are false.

• Presidents don't get to demand favorable portrayals in the press.