They don't call it the Golden Rule for nothing.

The easy definition for empathy is having compassion for others. We should be required as human beings to have it, but it's a choice we have given by God. So many people really couldn't care less about what they say about others, or how they treat them. You want people to treat you with respect... am I right? It goes both ways though. Mathew 7:12 says: "Therefore, whatever you want men to do to you, do also to them, for this is the Law and the Prophets" It's the Golden rule. You have to treat them the same way you wanna be treated. So if you're treating them like poop... they're gonna do the same. Poop for poop. But if you're being the better person, maybe you should let them know. Be like "Hey, I treat you good, so what's your deal?" they could tell you... but more than likely they won't, so some prayer about this couldn't hurt. Maybe they treat everyone like that because their life at home is all icky... it happens, so pray for them.
Maybe you like totally dislike the person. I know how it goes... take my word for it. Luke 6: 27 says this: "But I say to you who hear: Love your enemies, do good to those who hate you, bless those who curse you, and pray for those who spitefully use you" That's totally deep. God wants us to love everyone, and have compassion for everyone... even that chick at school who keeps making fun of your shoes. Or that guy who keeps calling you scrawny. Do nice stuff for people... it could change their life.