Either way- it's odd for an adult to suggest, that if they think someone is behaving like an idiot- their instinct is to join them. More and more like aog.
It appears to "upset" some that Boris has expressed support for England. Were they similarly disturbed when sturgeon was cheering on Scotland? Diddums.
What was obviously a tongue in cheek "question" in Chatterbank has been turned into an illustration of just who are indeed anti England by the usual hurt in anticipation practitioners. If a similar question had been asked with the circumstances reversed they would be saying it was light hearted joshing from the good old boys, and that the English had a humour tumour.