NL50: Draw to open-ended straight on two club flop?

[kewl_cph]

Ok, I was making a brag to my friend about a huge pot I won today. He's a winning cash game grinder at NL100 but I think he's somewhat of a nit.

He told me I played bad because I was probably only drawing to 6 clean outs.

I usually try to tell him that you can sometimes call with longshot draws if you think you'll get paid off (implied odds).

Is my call on the flop really so bad?

Results included because I've already given away the outcome.

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $11.20
Hero: $59.65
CO: $145.90
Button: $58.75
SB: $57.35
BB: $27.05

Pre-flop: (6 players) Hero is UTG+1 with 7[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/heart.gif[/img]
UTG calls, Hero calls, CO calls, Button folds, SB calls, BB checks.

Flop: 9[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/diamond.gif[/img] ($2.5, 5 players)
<font color="#cc0000">SB bets $2</font>, BB folds, UTG calls, Hero calls, CO folds.

Turn: 5[img]/images/graemlins/diamond.gif[/img] ($8.5, 3 players)
<font color="#cc0000">SB bets $6</font>, UTG calls, <font color="#cc0000">Hero raises to $20.5</font>, <font color="#cc0000">SB raises all-in $54.85</font>, <font color="#cc0000">UTG calls all-in $2.7</font>, Hero calls.

River: 2[img]/images/graemlins/heart.gif[/img] ($126.9, 1 player + 2 all-in - Main pot: $34.6, Sidepot 1: $92.3)


Results:
Final pot: $126.9
<font color="#ffffff">Hero showed 7h 8h</font>
<font color="#ffffff">SB showed 6s 6c</font>
<font color="#ffffff">UTG showed 3c 2c</font>