The moment you realize boxman (villians night out) embarassed himself, and acted the way he did at the party. Just to piss everyone off, and basically give all the villians a “big fuck you”
He knows all the villians don’t like him, and he just wants to piss them the fuck off.
During the dinner with Boxman in (We’re captured) he acted extremely mature and respect to his client. But he isn’t trying to impress anybody in (villians night out) he actually wants to crash the party.
only opinion he cares about is Venomous’s opinion, he even during the show called venomous his “best friend”
which is in a way honestly character development for boxman, to call somebody his best friend (or boxman could of been in the party crashing mood and jokingly called venomous his best friend, but thats probably unlikely)