folding aces postflop?

[bsball8806]

.5/1 NL home game shorthanded

BB: $80
Hero: $100
BTN: $300
SB: $90

Hero in CO with A [img]/images/graemlins/spade.gif[/img] A [img]/images/graemlins/club.gif[/img]

Preflop:
Hero raises to $4.00, BTN calls $4.00, SB folds, BB calls $4.00.

Flop: 3 [img]/images/graemlins/spade.gif[/img], 4 [img]/images/graemlins/club.gif[/img], 6 [img]/images/graemlins/spade.gif[/img] ($12.50)
BB checks, Hero bets $10.00, BTN raises to $30.00, BB folds.

Let me preface my play by saying that while the BTN and BB had been playing loose and calling raises with weaker hands pre-flop, they were switching back to typical tight-aggressive play post flop. The BTN was a solid player; I believed there was no chance he was bluffing in this situation.

I folded. Do you think I made the correct play (given that I could have easily been up against powerful draws, 2 pr/set, or even a completed straight? If not, what should I have done