He was never welcomed into the society of Hollywood A LIST people. Didn't like him didn't want him. He wasn't their cuppa tea. He never forgot it so being the elephant he is every chance he gets he strikes out at that decades old rejection.
Same thing the elephant brain does to President Obama. In 2011 I believe when chump attended some journalist yearly meeting President Obama took great pleasure in humiliating chump. The chump sat there like a lump and took it but he never forgot it.
That's what his constant attacks on Obama is all about. That early public humiliation sticks in his craw very bigly and so every way he can insult attack get back at President Obama he will because well the chump is such a small little man. He goal is to ERASE EVERY TRACE of President Barack Obama. He is OBSESSED by it and can't get back to undo it so it rankles him and infuriates him retroactively. The chump lives in yesterday most of the time. That's why he's always step or behind everyone else.