People come and go in your life. Some go and are never forgotten and some go and we don’t understand why. Those that choose to degrade you or put you down are only trying to be above you because they feel less than you. I say those people should leave and if they don’t leave on their own then you should escort them out. Close the door, let them flounder on their own. Life it to short to wonder why they are like they are just let them go and move on happily with your life.