Imagine if this person was allowed to compete in sports against women.
We don’t need to imagine - people like this are allowed to compete in sports against women. It is happening already. See the very many threads on this board about that.
Hands up I’d have made the same mistake - I completely understand the second ‘sir’ as well, when faced with a shouting, threatening, aggressive male-bodied/appearing person (hope that doesn’t offend the Eyes), trying to calm them down politely, of course your brain immediately goes to ‘sir’. It’s not like the shop assistant called them a motherfucking cuntface dickhead man. They said ‘sir’!
I hope with this being widely circulated that charges are bought against this person. They are violent and aggressive and it is simply not acceptable to behave like that in public, no matter what anyone else has referred to you as, let alone a slip of the tongue when addressing using a polite title.