Oddly enough when I was still on reddit many years ago I got the distinct impression that an awful lot of those who were very active on the various UK subreddits were actually Americans. They seemed to have these very weird caricatured view of the country and there was just something "off" about them. Some obviously came off as very sad left wing blow hards - I have encountered people like this in my sisters friend circle from university. You also do get a very vocal Scottish nationalist crowd - they come off as somewhat genuine. I do know people like that exist.

Same thing with people who claimed to be Irish - always distinctly bitter and very anti-English even though I have literally not encountered a single person from Ireland who actually held views like this and I visit the country all the time and have travelled to the most remote corners where the local pub is also the local shop and petrol station and many people speak Gaelic.