I'd call the flop. You are 4:1 to make the flush on the turn. The pot odds are slightly better than 2:1, but if you hit I'd expect to make another $6 often enough to make if pay.

Also BB may call (he did I see!) and the bettor may check on the turn, giving you a free card. He didn't raise pre-flop so if he has an Ace, I doubt he has a real strong kicker.

Against this since you are drawing to the 2nd nut flush, you have to allow for the possibility of making your flush and getting beat. Still I think it's a thin call.