50 NL pay off flush ?

[DickieBets]

This drives me nuts about 50NL. I hate paying these guys off after they play so badly chasing their draws !

BB is 33/8/3.6

Given the odds are 6 to 1, do I have any choice but to call even though I'm quite certain it's a flush ! Is it likely that he doesn't have a flush and push like this enough times for this to be profitable ?

Poker Stars, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

UTG: $12.95
MP: $77.65
CO: $49.25
BTN: $85.70
Hero (SB): $46.75
BB: $18.25

Pre-Flop: A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/club.gif[/img] dealt to Hero (SB)
4 folds, <font color="red">Hero raises to $2</font>, BB calls $1.50

Flop: ($4) 7[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $3</font>, BB calls $3

Turn: ($10) K[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $8</font>, BB calls $8

River: ($26) J[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">BB bets $5.25 and is All-In</font>, Hero ????