I don't generally believe the idea that academia isn't the "real world", but I think it is certainly true that people can get somewhat isolated and lose track of potentially valuable non-academic perspectives on things. Even if their perspective merely reminds you that there is a whole other world where people do not give a damn about your work and would rather talk about football. You should pay attention to those people, because a) they may have something valuable to contribute, and b) there IS a whole other world out there and you should know about it. And c) some of them might be living things that you're just reading about.
Wonderful post.
In my opinion, academia exists to make the real world better, but during my Ph.D. I found my research becoming increasingly esoteric. Now I'm trying to change my specialism to something more relevant, which is not easy at all.
But it is a two-way street; people in the "real world" need to recognize the value of academic approaches to real-world problems and value the diverse approaches to life. If your friends can't agree to disagree amicably, they're no longer friends.