1) Mr. P Means to say, they weren't trying to kill Indians but they were trying to kill India culture.
2) Jr was probably mad/upset that the teachers We're trying to kill his culture. Jr probably was hurt because he is India and that might hurt his feelings, because someone is trying to take away who he is.
3) if I were Jr I'd be mad/upset that someone tried to justify who I was. "I mean how can someone tell you what you can and can not do?"" I guarantee you, you wouldn't like it."