Uncle Phil started out very welcoming to the kid. He didn’t act like an overprotective father, but genuinely seemed to want to meet the kid and even referred to him as “son”, obviously to make him feel welcome. Only when the kid was a snotty punk and started saying stupid crap and refused to tell him his name did Phil put him in his place.
Funny how these types always seem to know what everybody else's place is, and coincidentally it's always "beneath me".