That's not what Acosta was doing. He was talking over the President and peppering him with questions, depriving others of the chance to do so.
I'm all for Reporters asking President Trump the toughest questions. I'd have every single reporter in the room pick one topic and go after it. delve into detail. Pin him down, make him look a fool for 45 minutes. Repeat questions when he doesn't answer your colleagues first round.
But I'm not going to condone behaviour that sees one reporter monopolise the time, expect to ask extra questions on different topics and generally act like an ass.
If nothing else, people should respect the office. The position of President. The structure of briefings etc. To not respect that means you're not left with much when that pleb vacates the seat.