How should I react when others complain about me?

Proverbs 15:31-32If you listen to constructive criticism, you will be at home among the wise. If you reject discipline, you only harm yourself; but if you listen to correction, you grow in understanding.

1 Peter 2:23He did not retaliate when he was insulted, nor threaten revenge when he suffered. He left his case in the hands of God, who always judges fairly.

1 Peter 3:9Don’t repay evil for evil. Don’t retaliate with insults when people insult you. Instead, pay them back with a blessing. That is what God has called you to do, and he will grant you his blessing.

Learn to discern complaining from constructive criticism. Constructive criticism is given in a loving spirit that has your learning and growth in view. Complaints, however, are often just a harmful venting of negative emotions. In such cases, ask God for the grace to be kind and loving in spite of it all.