Had an experience in Caernarfon a few years back.
Pretty much the same conversation.
He called me a plastic welsh english speaking southerner - so I responded in welsh a little
that made others in the pub laugh
The guy was a scouser fan and it was the day before a big game for them.
The irony of him saying that and me beng a CCFC fan has a few chuckles around the pub and the
someone shouted out 'who's the plastic welshman?
The Guy wanted a scrap!
I duly obliged.
But it stopped before it started and then calmed down.
All very strange!!!!