So here's a really odd question for the Brits on SW

I think @PepsiColaP has nailed it. It is being portrayed by advocates as a simple indication of national pride, whilst also being a counter to how Palestine flags and Ukraine flags have been allowed to be put up by protestors against those particular conflicts. But we all know that there is a strong xenophobic vibe behind it. It's like an unspoken truth by many, a very much spoken accusation by those on the left and a smug grin by those on the far right. It's a combination of malicious trolling and the marking of territory.