Yeah, I watched, and I agree with this:
https://www.buzzfeednews.com/article/emilytamkin/diplomats-un-laughed-donald-trump
See, when he says 'my administration has done more in two years than' everybody in the room was like 'oh my god, is he really about to suggest his presidency has been a historic success' and then Trump said as much. So, at that point everybody had dropped jaws from Trump's tall tale, he was then heckled, and then people laughed because somebody finally told the emperor he wasn't wearing clothes.
But you think what you want. And hey, drink Ovaltine.