What's the most pathetic way you've experienced classism in the UK?

Anyway, curious what everyone thinks. Feels like it's one of those things that's so baked into everyday life here that most people don't even clock it half the time, or if they do they just brush it off as "oh that's just how it is."

Could be something big, could be something totally trivial and stupid honestly the more mundane the better. Love a good AskUK thread on this sort of thing.