I remember getting a hand-me-down digital ‘black book’ to store phone numbers during the age of the palm pilot. It had a ‘dial’ button and a speaker on the back. You could pick up the phone, put the speaker against the phone’s mouthpiece and it would ‘dial’ by playing the correct tones. Blew. My. Mind.
The difference is between cursing and cursing AT someone.
“The garage door broke.” “Ah, fuck.” - Fine “You fuck.” - Not acceptable
If you get a written warning, it’s probably time to start looking for a new job regardless.