There’s something seriously off about this story, and I can’t help but think you’ve left out some significant details.

But to answer your question, nothing. You do nothing.

You go to work, avoid people that you aren’t required to do your job, and try not to say things that will get you in trouble.

I personally have no problem with fuck or any other words, but there’s a time and a place. If you dropped an F bomb in front of my customer/client/patient, I’d give you a stern warning not to let it happen again.