> pro-Brexit (the founder is very anti-EU and publishes an in-house propaganda mag to that effect), pretty right wing, heavy drinkers

That's a massive stretch. In my experience, the common denominator with Wetherspoons is it's somewhere people go for the cheap drinks and food. You get people of different backgrounds, age ranges and political beliefs going to Wetherspoons pubs (including plenty of apolitical people). The only undeniably true statements is that Tim Martin was pro-Brexit and there was anti-EU material in the Wetherspoons magazine around the time of the Brexit referendum, but beyond that it's not an issue that's particularly high profile anymore, it's not part of daily conversation like it once was, many people have moved on from discussing it.