Mean People

Ok how do you act or react when someone is deliberately mean to you? Me personally I can ignore a lot of b.s. and I can really be a bitch at times, but I'm curious how do others act when someone is purposely mean to them. I know It isn't holy and God like living with a revengeful mind, but boy is it fun. I hate when someone does something stupid to me, because I know in my mind as long as I live I will one day get you back. I know, I know some may think thats not good, but oh well.