I’m not nice when it comes to evil things.
Being courteous to false teachers, subverters, those who wish to damage God’s kingdom and His church is in itself subversion by Satanic forces.
The same God who nuked Sodom and Gomorrah, had Moses massacre those who built a golden calf, who had Elijah slay 400 priests of Baal, is the same God we serve.
Harsh words are a mercy.