He might be a middle class home counties boy now but I'm not sure he was then and as Jordi points out, he writes about a time before Italia 90 and Sky, so it's not his fault it was part of that wave.
You're right about the universal thing though. Football fans (including me) tend to get a bit snooty about how we're represented because we're a broader church than people realise.
There's a chapter in the book where he follows Cambridge for a couple of years while at university and while there gets in an argument with another student who's adamant he couldn't be into literature and football at the same time. That was how we were seen by some back then and then it flipped to a certain extent. I'm not sure who won in the end. I don't see many people reading a Penguin classic at half time. (Eating one, perhaps).