(a) I would try to convince my friend that being a poor is not a crime nor a matter of laughter. Hence, he should not tease his classmate. Instead, he should take care of his dignity and self-respect.
(b) I would stop him/her to do that.
(c) I would advise my classmates to be friendly with one and all.
(d) I would not get involved in the joke and would proceed from their immediately.
(e) I would try to convince those boys that girls are in no way less efficient than their male counterparts. I would give examples of Kalpana Chawla and Sunita Williams who did what many men could not think of.