That sinking feeling...

I played this hand extremely weakly (haha, because I had that funny feeling), and a player I greatly respect (who was at the table, but not involved in the hand) feels strongly that I cannot overcall the river. I don't know if I can agree with that, so here is the hand for future reflection:

hand #1
live $20/$40 LHE, 9 handed
UTG is a loose player, capable of firing multiple bluffs if he senses weakness, but will also make thin value bets
Poster and Button are unknown players;
preflop: Poster is posting between the Buttton and the SB; UTG limps, mucked to Button, Button raises, Poster calls, SB mucks, Hero calls in BB w KhJh, UTG calls (4 players, pot size 8.5 small bets)
flop: AsAdTs, checked around (4 players, pot size, 8.5 small bets)
turn: AsAdTsQd, Poster checks, Hero checks, UTG bets, button calls, Poster calls, Hero calls (4 players, pot size 8.25 big bets)
river: AsAdTsQd6d, Poster checks, Hero checks, UTG bets, button calls, Poster calls, Hero shakes his head dejectedly and calls; UTG says, "I have an A but there is no way I win". Button tables his QQ, Poster mucks without showing.

Personally, I like my turn and river lines just fine. All the value for my hand gets bet (as could readily be expected) by the opponent on my immediate left. I have a showdown hand, and I get to close the action. I really can't see how I can muck on the river with no history from Button and the Poster. From my perspective, the more questionable decision is am I losing much value by not CR the turn?

BTW, the commentor on the hand claims I should have been able to read that Button had QQ when he called the river? WTF?? (The commentor is often a far better hand reader than me, so maybe I'm missing some visual clue. I'll have to follow up with him...)