followed with ‘I wasn’t aware is so important to you. I didn’t want to insult you and if you felt so, I apologize. The word fuck is one I use very often, but I’ll try to control myself around you’
Note I didn’t insult the coworker (no fuck you or fuck off), but simply said ‘fuck’ out loud due to a job error.
This assumes OP was not professional. The best answer is “thank you for making aware of your feelings”. They will think they are right and you can turn around, roll your eyes and make a jacking off motion.