It's how the Brexit situation is handled. Thoughts on the entire real thing aside, there's a place for separatist stories in science-fiction and it being relevant and recent is perfect - sci-fi is the place for social commentary after all. But it needs to be nuanced and intelligent. 3WExit is neither.
The problem is it's a parody. And it's one-sided. I'm not one to really share my political opinions as I can't be arsed with people shouting theirs at me, but I sat on the same side of that yes/no vote as Barnett obviously did. And jfc if Barnett isn't determined to paint everyone on that other side as a clown. There's no exploration of the benefits or detractions of that question. Everyone is just a caricature of a raging racist Brit - aside from that one taxi driver, if I remember rightly?
And when the story does stop trying to just rip the shit out of leavers and take itself more seriously, it's just a boring retread. Seen this all before.