Being "Cultured"

What makes something "cultured"? What is that even supposed to mean?

Dictionary.com says it's means something is enlightened; refined.

But what does being enlightened or refined depend on?

It seems like knowing a lot of the "classics" whether in music, or literature, or art, is a qualification for becoming a cultured person.

I feel like this term is wrong. Being cultured, I think, should be about knowing all different aspects of a certain area. It annoys me when critics say something popular is trashy just because it's popular today. There must be a reason people all like it! Being commonly liked shouldn't make something lame or looked down upon.

By knowing pop culture, I think people can actually go far because it's information that they actually need and because it's what makes them a part of the society around them, not a society from 200 years ago. However, at the same time, I also guess knowing older stuff is also somewhat important, since all cultures are backed to some degree by history.

But the term really should be broadened to all things, from ancient to pop-culture :)