If you were being a **** and he called you a ****, then what's the issue. I would be more concerned with the fact that your performance was obviously not up to scratch or if it was that your immediate superiors and colleagues either have an issue with your work or with you personally for this to be bought to the attention of your senior manager.
It sounds as if you have larger issue at work than the fact that your boss called you a naughty word.
It sounds as if you have larger issue at work than the fact that your boss called you a naughty word.