Bad? Hmm I'm not sure that's the right word? Hurtful might be a better word.
Of course teens are aloof towards their parents, they think they're 'out of touch with reality', are old and don't know anything. That being said, it doesn't remove the fact that they created you, and enjoyed you as you were growing up, as you did with them. Now suddenly, you want nothing to do with them. That's very hurtful to them. You should look at it from their point of view.
It won't harm you to talk to them when you get home from school, and tell them about your day. They are interested in you, they obviously love you. You're lucky that they do, because there are too many parents these days that don't give two hoots about their children, and you probably know that. /// I remember one time when I came home from a school play, (I had been at school all day, stayed after school for band practice, and then the play), it was late at night, I was tired and just wanted to go to bed. My mother asked me how my day was, and I just said 'good'. Well, that didn't go over very well. I still remember hearing my mother crying at the bottom of the stairs, saying that just wanted to TALK to me, that's all. And that we didn't TALK anymore. Looking back on that, I know I broke her heart a hundred times, but she still loved me.
So Please, take the TIME to Talk with your parents. They just want a little piece of you, you don't have to spend all night with them, listening to their music, and watching their programs. or hang out with their friends. LOL You are growing up so quickly before their eyes, it's hard for them. Please remember that. You'll be a better person for it, too, in the long run. Your parents won't live forever, and you'll miss them when they're gone. BELIEVE me, and you can't go back and undo past mistakes. So appreciate them while they're still here, by giving them your Time.
I hope this helps.