My friend said, "Some people are really weird. Even though I just treat him the way he treats me, he actually gets angry."

Everyone has different things they can bear. Although it is said that one compares one's feelings with one's own, this is always untrue. It is unlikely that the same way of getting along will work for everyone, and most people are selfish and will naturally say anything that is beneficial to themselves. If this friend wants to continue making friends, then he should find another way. Nothing in the world is equal, and if he wants to maintain this relationship, there is nothing he cannot accept.