My Bacon Roll wasn't about Brexit per se, but the character was described by MK as "Brexit man" and I knew exactly who he meant as soon as he said it. There are lots of them in the UK. They are pejoratively known as "gammons", basically old white men who don't like that things are changing and that lots of people don't want the country to be run by old white men anymore.
Here's a prime recent example:
https://www.standard.co.uk/news/politics/lee-anderson-defect-reform-uk-tories-sunak-b1144526.html
I find your comment absolutely ridiculous. I'm not sure why the colour of the skin is even relevant. I don't detect anything in the song that even refers to white people. Old black or asian people don't also struggle with things changing around them?
It’s relevant because IN MY OPINION and also perhaps my importantly, in my experience, this is what “Brexit man” usually looks like, and MK says the song is about Brexit man. I don’t see myself like that, but clearly I’m in a minority in the UK, as those who wanted Brexit made up the majority here.
I was deployed in the UK from 2014 to 2018 and, in my experience, the majority of the people I interacted with that wanted Brexit were British Indians and to a lesser extent Pakistanis, some of them had moved to UK back in the 70's. On the other hand, most of the white British people I talked to were in favour of remaining in the EU.
This is why I find the idea of the Brexit man as "white old man" as ridiculous and, in a way, quite discriminatory.
But I should also say, as a P.S., that I understand where you're coming from as this discourse against natives and "white old people" was becoming quite common among some factions of the political spectrum in the UK, at least when I was there, and being used for ideological reasons. So I understand very well what you mean. And since I haven't set foot in the UK since 2018, I can deduce it's still around.