There is no universal legal definition of hate speech. In general, it is communication used to intentionally harm any identifiable group including those categorized by ethnicity, gender, sexual orientation, or religion. The Bible condemns hate speech. It calls us to seek to live peaceably (Romans 12:18) and to pursue peace (Matthew 5:9; 1 Corinthians 7:15). We are to remember that all people are made in the image of God (Genesis 1:27) and that the goal with our speech is to glorify God, point people to Him, and bring good and healing to those around us (Ephesians 4:15, 25, 29; Colossians 4:5–6). At the same time, we need to be wise about what the world labels as “hate speech.” Speaking the truth is not hate speech, but we must remember to express it in love and for the good of the other person.
The Bible is clear that Christians should love their neighbors (Matthew 22:37–40), instead of speaking hatefully to or about them. Where the problem comes in is with society's definition of "hate." We are to be respectful, forgiving, and peaceable, but we are also to speak the truth. The most hateful speech a Christian can indulge in is speech that pushes another further from God's truth and love.
For example, it is wrong to use words to incite others to hate Muslims, but it is also wrong to allow Muslims the freedom of religion in matters that contradict human rights such as honor killings and child brides. When visiting Thailand, it is inappropriate to insult or disrespect the king, but as believers, we remember our true King is Jesus. It is appropriate to say that a group and its members hold unbiblical or incorrect beliefs, but it is not appropriate to call them stupid.
It is wrong to minimize or deny how homosexuals have been hurt by the careless or malicious words of Christians; it is possible and good to acknowledge and apologize for the harm caused by ungodly reactions to sin, even while still naming sin for what it is.
It is inevitable in this fallen world that those who reject God will communicate that rejection in ways that disparage His followers. We should expect persecution (2 Timothy 3:12); it is a sign that we are Jesus’ followers (John 15:18–19). But Jesus gave us an example as to how we should respond: "When he was reviled, he did not revile in return; when he suffered, he did not threaten, but continued entrusting himself to him who judges justly" (1 Peter 2:23). Likewise, Jesus told us that if someone insults us, we should respond mildly and without offense (Matthew 5:38–39).
And the Bible tells us why: "And the Lord's servant must not be quarrelsome but kind to everyone, able to teach, patiently enduring evil, correcting his opponents with gentleness. God may perhaps grant them repentance leading to a knowledge of the truth, and they may come to their senses and escape from the snare of the devil, after being captured by him to do his will" (2 Timothy 2:24–26). Every word we speak and every reaction we give to the words spoken to us should be measured against this goal: to lead others to the knowledge of the truth.