Apparently journalists aren't very happy that the press conference was bullshit, that impertinent questions led to abuse of of the journalists, that Trump brought a cheering section of his staffers in, that staffers looked over their shoulders at their notes and asked about them.
Press conferences don't really matter that much anyway. Just one of those ritualistic things we're all used to. Just get rid of it, spend your time doing something else. Stop whining about it.