I recall an incident reported a couple of years ago.

Two women of let's say foreign appearance, were chatting on a bus.

A man of far right views couldn't understand their language and took exception
and berated them saying something like
"you're in England now - you should be speaking English!"

One of them replied, in English,

Actually, we're in Wales and we are speaking Welsh - what's your problem?"

There wasn't a hole deep enough for him to crawl into.