Political movements in general don't seem to be particularly immune to flag shagging, only the colors vary a lot.
But I am pretty sure that Banksy means right-wing flag worship as well. He is a master of "provocative conformism" and wouldn't produce anything that would get him into a real risk of controversy. His art is very fine-tuned to the sensibilities of the English and American chattering class; same recipe for success as Paul Krugman or Malcolm Gladwell.
Quantity has quality all of its own. Although many different causes use flags for promotion, the obsession that certain elements of the English right have with the English flag is at a completely different level.
You may want to check the obsession that people on the left have with the Palestinian flag. Any situation is good to show it off even when it has nothing to do with Palestine.
There were definitely places where you had 7-8 of them in your view while walking random streets.
(I’m more likely to see the white rose of the House of York in “opposition” to the flag shaggers than a rainbow or anything else, in my neck of the woods, but there’s only a few of these flying)
I do like the wider interpretation though, that any ideology can blind you.
Personally I kind of thought of Russia which is about the only lot marching off to war with Russian and Z flags all over.
The St George lot mostly just moan about immigrants.
Idiots.
I'm seeing a lot of flags.