That, was a joke.
I say don't worry about it man. This guy is obviously jealous of your work and wished he could do the same.
It would be a shame for you to be warned off because of this guy. If it was me I’d tell him to “go and f*** himself”
And if he’s reading this and has a problem, email me! I live in the UK too and would gladly have a face to face meeting!!
Nothing but a Coward and a moron.