My personal hunch on this is he tried to integrate into that club, did something immature and douchey, and got mocked and rejected. Which fueled his already emotionally unstable brewing hate mommy, hate daddy, hate self identity issues.
Nightclubs, especially 'alternative' clubs, can be close knit and cliquey with the network all knowing each other. And it's clear he ain't in it.
I do not think [Orangeman bad] --> sufficient condition for whatever affirmed consequent comes next.
For starters Orangeman Bad was never against gays and had atleast two MAGA lieutenants openly gay (Milo and Andy).
Kid's mom was 40 yr okd adolescent with codependent revolving door of boyfriends and alcohol issues.... tied herself up to the bed and called the cops to walk in on her.
Kids dad was a absentee father, and a meth using porn star.
Republican grandma was the ONLY thing that gave this kid any stability whatsoever.
But Orangeman Bad, therefore motive.