help!

What's the problem? You should report him to your principal of his bad behavior. A teacher shouldn't act like this, specially when he has the authority of teaching many students. I think it's not proper. You can also say it to your parents and i'm sure they will do something about it. There's no need to teach him a lesson, just report him.

Well, sometimes its unavoidable that we feel depressed for the day..but for the health its not a good side, i believe in Meditation which will balance our mind and helps to be normal at situations

HMM.you have to tell him that,we are just comes at here for learning about the perticular subject,and for that we are paying.we are not here for listening your slangs.we are from the good families,if you again behave with us like that so we have to leave ur batch.and we publish your character to the outsiders.i think it's gonna be enough for him.