The most annoying bad beat I've ever had

I'm playing $3-6 kill at El Dorado. During a kill pot (in which the stakes are $6-12), I raise in a late position with 8c8s. I get two callers, one of which is an IDIOT holding 7s2d. The board comes Jd, 5s, 3d. I get checked to, and I bet out $6. Both call me! The guy with 7s2d has a 7 high! Anyway, the next card is an 8d, giving me a set of 8's. I get checked to, I bet out again, this time $12. One folds, the other calls and chuckles with his 2 of diamonds flush draw. The river comes and he hits his last diamond! He caught a running flush against my set! With 7-2 of all things! He laughs out loud and says "Look at the card I'm going to beat you with." and shows his 2 of diamonds. That was sooo annoying. Not only did he win with the worst hand in poker, but he actually had the audacity to laugh at me. In the end, he went broke and lost $300 really quickly... like within 30 minutes. Sadly though, $80 of that was mine.