Well, vitty....I didn't like it when my daughter had friends who's parents let them run loose and do whatever they wanted....she thought she should be able do the same....so now she has a smoking habit....cigarettes that is! She is good person though....
I know what you are going through...I had verbal fights with my kids....Teens think they know it all. You can't take that pleasure away from them no matter how hard you try.
Just agree with them....YES, your right and remain silent after that. The pause gives them time to think.