One additional point on top of the many about the China answer to the reporter.
I think the thing that enraged him was that the reporters didn't let him get away with his usual trick of switching questioners to avoid follow-up questions.
The second reporter waited for the first to follow up. So Trump tried a third reporter, but she waited for the second one to have her turn.
So he went off in a strop.
His next thing will probably be to go to OAN or FNC or his press secretary whenever he finds himself in this predicament of losing control.
http://twitter.com/axios/status/1259959091704799233