I don’t agree one way or another with the interaction you’re having right now, but I will tell you what God‘s Word says about foul language.

I had a horribly foul mouth for many many many years. God change that for me by me memorizing this scripture.

“Let no corrupt word proceed out of your mouth, but what is good for necessary edification, that it may impart grace to the hearers. And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption. Let all bitterness, wrath, anger, clamor, and evil speaking be put away from you, with all malice. And be kind to one another, tenderhearted, forgiving one another, even as God in Christ forgave you.” ‭‭Ephesians‬ ‭4:29-32‬ ‭NKJV‬‬ https://bible.com/bible/114/eph.4.29-32.NKJV

It’s not just the F word.! Although I can say there’s a whole Nother side to all of this, I have to go with what God‘s Word says.