It's hard to say how I'd handle it because it's so easy to take the high road when you're not in the heat of the moment. This kind of thing motivates me though. I mean I would work out, try to make myself the best I can be because it would just piss me off so much that someone thinks down of me that I'd want to show them up in a sense...but I know I'm not really doing it for them I just use it as a motivator. Since I'm a guy if it was a girl my goal would just be to make her jealous by taking care of myself, trying to look better maybe, act better but when she wants to talk to me I wouldn't want to ya know...give the cold shoulder and never forgive her because holy F\*ck that would piss me off enough to never forgive them! I think who ever she talked to, even if they laughed in the moment I think they knew how f'd up it was, likely felt bad for you, and when they see you on the good days they'd feel extra bad. I think she just made herself look bad, not you.