He may have explained that no disrespect was intended, and while if he was only using the "fcuk", which is still suggestive, that would be one thing, but when he adds the "boi" to the end of it, that changes everything. It now becomes disrespectful and very suggestive.
As I said, I don't really care, but in keeping with nics that have appeared in the past that were also questionable and in which the person was told to change it, we need to keep within a guideline. If it this is to be allowed you will open the flood gates for others to alter their nics. Just a thought.