This man is a fool, in the Biblical senses.
In the biblical sense of the book of Matthew in the chapter called five by a Catholic and the verse called twenty-two by a Catholic turned Protestant we can read:
But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.
That's unlikely. He doesn't believe in faith alone.
Do you want to be shown, you foolish person, that faith apart from works is useless? James 2:20