If they respect you, respect them. If they disrespect you, still respect them. Do not allow the actions of others to decrease your good manners, because you represent your self, not others.
“I speak to everyone in the same way, whether he is the garbage man or the president of the university.” ~ Albert Einstein
“Respect was invented to cover the empty place where love should be.” ~ Leo Tolstoy
One of the most sincere forms of respect is actually listening to what another has to say. ~ Bryant H. McGill