It is actually about the journalist profession and awards, NOT the POTUS, however the POTUS is typically "roasted" by a comedian hired as entertainment and allowed to give their own condensed speech.

Well, no comedian was hired as entertainment. A glorified magician was. So trump wasn't roasted, but he was still allowed to give an hour long, hatefilled speech which should have surprised no one, never mind shocked them into "stunned silence".