Trump did not use his entertainment and his business credential to talk down to an “objective moderator.” If he had done so he would not have merely gotten huge applause, he would have started a demonstration in the aisles similar to what’s seen in political conventions. He would have proved that Kelly did not know her audience and Trump did. Kelly would have lost control of the situation.
Judging by your comments, you didn’t see the debate. The audience went wild for him at several points. But it was the first debate. Nobody was going to get in the aisles over her stupidlty - it wasn’t worth it; and Trump took care of it himself, to loud applause.