I have the same problems with guitar playing at my house. My parents get mad if I play too loud, and even if it isn't loud they get mad because "all you care about is your damn music. You don't have any interests. Why are you so negative all the time? Why do you have so much anger?" And so on. Not in a concerned way, in an angry way like they want me to go milk a cow or something so they can be proud of me. I don't see what playing guitar has to do with negativity and/or anger, unless they mean the anger I show when they get down on me for playing my guitar all the time and not wanting to do anything else.