Have there been people in your life that just seem to rub you the wrong way? We are to be nice to all people according to what the Bible says. I always say to try to 'love people with the love of Jesus'. Jesus would not be hating and saying ugly things about people and we are His children so we should not be acting like that either.
When someone is mean to you or has hurt you try to 'turn the other cheek' and blow it off. To get angry and upset and continue til you reach your boiling point will only make matters worse. Romans 12:21 says "Do not be overcome by evil, but overcome evil with good." Proverbs 25:21 says "If your enemy is hungry, give him food to eat; if he is thirsty, give him water to drink." This is a way to overcome evil with good. There are some people who are so hard hearted they may never be won over and for those few you need to just turn them over to the Lord and let Him work on their hearts. Matthew 5:44 says "But I tell you: Love your enemies and pray for those who persecute you". Perhaps a co worker has done something behind your back or someone else has been mean and hurtful to you. You can not dwell on the hurt and let things fester. You have to move on in life or you can almost become a 'nut case' over it. Release the hurt to God and ask Him to help you 'get on with life'.
Let's take the scenario that is a bit more drastic. What if you are in court and someone is suing you? Would you hate them? That is the natural instinct but I feel God wants us to literally take that verse to heart and attempt with His help to love your enemies. Love those who are taking you to court. Pray for them. Pray for their hearts to be softened. This could be a divorce situation as well where a faithful spouse has been hurt. Perhaps you want to hate the person. Rightfully so on human level but God wants you to do it His way and to pray for them. This is hard to do and can not be done in human strength.
So what is your battle? Who do you need to pray for and forgive? Release the person to God. Let Him do a work in their heart. Your job is to just practice being nice and showing God's love.
PRAYER: Lord Jesus sometimes it is hard to be nice to those who are not nice to me. I know Lord we are to show your love to all people. Transform my heart to be able to do this as in my own power I can not. In Jesus Name. Amen.