NL50 - Overpair facing c/r on coordinated flop

[Arp220]

So I'm currently on a 6 buying downswing and beginning to doubt everything, fear everyone, and cower in fear at shadows. Part of this includes second guessing everything I've done... like this hand, which has been bugging me... did I make a good or stupid laydown?

sorry, no nice hand converter, my hard drive died:

Full Tilt NL50 6 max. Hero (Button) has $50, Villain (UTG) has about $100. Villain has done nothing out of the ordinary in the 20 or so hands I've seen.

Hero is dealt AcAs

Villain raises to $2, two folds, Hero raises to $7, two folds, villain calls.

Flop comes 5c7h7d.

Villain checks, hero bets $9, villain raises to $20, hero folds.

What little I'd seen of villain suggested TAGy, and that coupled with his call of my reraise preflop made 55 or 77 his most likely holdings... and also he'd be unlikely to try a c/r with 88-QQ given my RR preflop.

Dumb? Standard? If dumb please tell me in detail why [img]/images/graemlins/smile.gif[/img]