I would generally call AQ here because it's just fairly strong in terms of absolute hand strenght and villain can definitely have AQ for value himself. But I agree that it's not particularly exciting against a tight opponent who generally doesn't show up with a lot of bluffs in big pots. You can fold it with reads I suppose but defaulting to folding seems a little excessive to me.

Hi, I'm back with this hand. I can't sleep because of that :)
Villain bets on river QQ +, AQ. I won't count AQ because it's a draw. So QQ + = 10 combinations. We block some AA and QQ because we hold AQ. We need the opponent to bet 5 combinations on the river. I can't imagine 5 combinations that would make an opponent blufol on the river. By the way, it's an underblufer. So why do you think it's an easy call?

Thanks!

If you have decent sample on him then I think ok to overfold there against this player profile but I agree with Samu Petronen - you should not make think about folding as default play there.

How do you construct you defend range UTG vs MP 3b? Do you have AA/KK here? if you do, we can consider a fold. I think we have to call this since it is the best hand hand you can really have here if you don't ever trap. Your read needs to be razor sharp to fold I think. I don't think we will have much 66/55.

Preflop
If you can't find calls on the river, you can probably fold preflop against this 3betting range though - high 4 or low 5% here probably.

Postlop
What's checking the river that bet the turn? That's what we're asking right?

If everything short of a nut hand checks on the river but villain is bluffing and semibluffing up to that point, we have an exploiting fold.

Also,
If you have Peter Clarke's book, Hand 130 is a similar hand from villain's POV with a polar betting range. 3bettor is from button and is using a polar range, but it shows how tight the 3betting profile is against UTG - very tight.