Shutting people down when you don't agree with their position is rude, arrogant and disrespectful. I'm sure aides and advisors must have tried to brief him prior to yesterday's speech and press conference, but to no avail, because he just doesn't listen.
The same thing takes place at my job during staff meetings. Someone has the floor, and he or she gets interrupted. I thought we all learned from age 3 not to do that. Arrrrrggghhh.