Don't give them the chance to disrespect you, no one diserves this, they are probbaly miserable people haunted by their past and hurt. Be strong, it's ok to be sensitive, but they don't deserve to have the chance to make you angry with the things they say and do. Focus your attention on your friends and family, they are worth it.
What did Gaga say if you have no shadows you are not standing in the light. Generally disrespectful people are so miserable, have been disrespected themselves at some point. So like Randy said don't let it get to you. It's their problem. Build a world of friends and maybe family where respect, creativity, freedom, love reign. People who don't like that program well bye bye to them.