I had an ex who I loved with my all my heart and I treated him so good to the best of my ability. What I got back from him was name calling and cussing, him basically cheating by flirting with other girls in front of my face, him blaming me, him forgetting important things like my birthday, etc. I didn't understand why he treated me so poorly, but then one night I went to bed, asked god to give me answers, and I literally woke up with them. People who are mean and cruel to you don't do it because something is wrong with you. They do it because they don't know about Jesus and feel bad about themselves. Look at Jesus for example. How could people treat Jesus like there was something so wrong with him? Remind you that Jesus was 100% PERFECT and sinless. Jesus wouldn't harm a fly. Imagine someone who could do no evil, no harm to anyone whatsoever, and still loved everyone no matter what they did. He had nothing while he treated people to a big feast, did other acts that made him so great, but people still planned to kill him and pin him to a cross. I don't think he deserved that at all. My point is, people in this world who are mean for no reason probably don't know Jesus. Don't get mad at them, feel sorry for them, pray for them, and hope that Jesus will guide them.