Keep in mind, hurting people often hurt other people as a result of their own pain. If somebody is rude and inconsiderate, you can almost be certain that they have some unresolved issues inside. They have some major problems, anger, resentment, or some heartache they are trying to cope with or overcome. The last thing they need is for you to make matters worse by responding angrily.
I came to the conclusion long ago that all religions were true and that also that all had some error in them, and while I hold by my own religion, I should hold other religions as dear as Hinduism. So we can only pray, if we were Hindus, not that a Christian should become a Hindu; but our innermost prayer should be that a Hindu should become a better Hindu, a Muslim a better Muslim, and a Christian a better Christian.