This seems to be an interesting take on the interaction:
This was an AMBUSH at The White House
The mere presence of Vance, the TASS reporter who got expelled at the last moment, the stupid question about not wearing a suit, the comments about discussing stuff "behind closed doors" instead of "in front of the cameras"... they all make the interpretation plausible. It gets compounded by the latest draft of the agreement being nothing like what Trump had been screaming about.
IMHO, it looks like Trump wanted to reenact his interpretation of the negotiation process in front of the cameras to make himself look great, but Zelensky didn't want to take part in the charade.