Live 5/10 game. Extremely deep.

Table Dynamics: Hero had been "captaining" the table up until this point. Villain is a "meathead" who is prone to tilting but is generally an aggressive but straightforward player. Villain may have been slightly frustrated at this point and had been drinking. To this point I'd been "owning" him picking off a few bluffs and getting some thin value bets paid.

9 handed.
Hero raises to $35 UTG+1 with KK
MP station calls
Button TAG calls
Villain in BB 3bets smallish to 150
Hero 4bets to 375 for obvious reasons
Fold
Fold

Villain tanks for about 30 seconds and goes all in for about 4.2k. Hero covers.

I proceed to talk to the villain trying to illicit a read or feel for how strong he is. He is responding to some of my banter and appears confident but nervous at the same time. I.E. responding to my banter but his demeanor is nervous. I ask him what he thinks I have to which he responds QQ. I show him my kings and he seems legitimately surprised.

Call or Fold?

Any other tips on picking up a read or gauging strength / weakness here?