Probably not - however, I was frustrated, embarrassed as this was happening in front of other passengers and he was being overly aggressive to me in his manner - hence the phrase 'Why are you acting like a prick?". Its noted in his statement that I apologised straight away - we are all human and very briefly lost some control. As far as the phrase 'foul and abusive language' is concerned, I have not denied it wish I hadn't said it. However, calling one word foul and abusive language feels a bit of a stretch.
If somebody came to your place of work and called you a prick for doing your job - while at least potentially committing a criminal act, no less - I'm sure you'd want your own employer to take the strongest possible action. It's entirely unacceptable conduct, an apology does not fix it, and it's turned this case from one which sounds like it'd be borderline between a settlement and being dropped entirely into one where it's borderline between a slamdunk bylaw conviction for the abusive language at least and a full RoRA convction. The sooner you accept this and accept the fact that there's quite rightly going to be a serious consequence for abusing that staff member, the better your chances of eventually avoiding the worst outcome.