Am I the Knucklehead or is he?

HAND I played recently on bwin.

Seat 2: (8,240)
Seat 3: (2,065)
Seat 4: (17,300)
Seat 5: (12,560)
Seat 6: (9,400)
Seat 7: (5,555)
Seat 8: (5,415)
Seat 9: (16,880)
9 posts the small blind of 250
2 posts the big blind of 500
The button is in seat #8
*** HOLE CARDS ***
Dealt to ME [Qd Jd]
3 calls 500
4 folds
ME... 5 calls 500
6 folds
7 folds
8 calls 500
9 calls 250

2 checks
*** FLOP *** [Kd 9d 9c]
9 bets 2,500
2 folds
3 calls 1,565, and is all in
ME... 5 calls 2,500
8 calls 2,500
*** TURN *** [Kd 9d 9c] [Kc]
9 bets 500
ME... 5 calls 500
8 has 15 seconds left to act
8 raises to 2,415, and is all in
9 folds
ME... 5 has 15 seconds left to act
5 folds
8 shows [2d 6d]
3 shows [Qc Ks]
Uncalled bet of 1,915 returned to 8
*** RIVER *** [Kd 9d 9c Kc] [3d]
8 wins the side pot (4,305)
8 shows a flush, King high
3 shows a full house, Kings full of Nines
3 wins the main pot (8,760) with a full house, Kings full of Nines
*** SUMMARY ***
Total pot 13,065 Main pot 8,760. Side pot 4,305. Rake 0
Board: [Kd 9d 9c Kc 3d]
Seat 2: (big blind) folded on the Flop
Seat 3: [Qc Ks] and won (8,760) with a full house, Kings full of Nines
Seat 4: (folded)
Seat 5: folded on the Turn
Seat 6: didn't bet (folded)
Seat 7: didn't bet (folded)
Seat 8: (button) showed [2d 6d] and won (4,305) with a flush, King high
Seat 9: (small blind) folded on the Turn

Not sure I get this guy. Was he smart enough to try and get a higher flush off his hand?
Was I an idiot for not winning this hand and calling when the board was double paired with just a flush draw? 2nd nut at that.

Opinions welcome...