Im lost with AA

[Mayhem]

From what we know:

He hasn't played 1 orbit, so he is either picking his spots, a tight player, or just had crappy starting hands.

Assuming the first two, what hands could he have that scare you?
KK/JJ - most players will PFR with these, especially in mid position with 1 or no callers in front of you, so you really can't put him on these
22 - as said above, this is a possibility, but a 6x BB raise to a tight player? I would think he'd junk that every time.

QJ clubs - very loose call by him pre-flop, and just dumb to miniraise in EP after a pot sized bet with an overcard on board

I would put him on AK, MAYBE KQ. I think he's one of those pick your spot guys with AK/KQ, flopped his K, and knew you were going to continuation bet after the flop so checked into you.

I'd push.