“With the tongue we praise our Lord and Father, and with it we curse human beings, who have been made in God’s likeness. 10 Out of the same mouth come praise and cursing. My brothers and sisters, this should not be.” (James 3:9-10).
Other people deserve your respect because they have been made in the likeness of God. Every person is inherently valuable, even those who hurt you, lie to you, and mistreat you.
Therefore you should not curse or swear at other people, even when they do wrong to you. Instead you should love them the way that God loved you. After all, you are a sinner too.
Love your enemies and pray for them that they might repent and be forgiven of their sins.