Why Sneer at Wetherspoons?

... the boss pushing brexit seems a pretty good reason.

https://en.m.wikipedia.org/wiki/Tim_Martin_(businessman)

They're not bad, certainly cheap, often the only place around. But they do tend to attract an older crowd, do have a lot of food moving around and don't have music. So they're not the sort of place you'd include if you had a classic British pub crawl planned. That's not sneering, just horses for courses.