natural segregation?

This morning as I waited at LGH to get blood drawn, I noticed something very odd. The way the waiting room is set up is there is a big room, which is separated into smaller room-type things with chairs set up in U shapes, which a row of large fake plants separating each U. The chair U closest to the room that everyone is waiting to get into also has a TV, but none of the others do. This is the section that I naturally walked to. I mean, it was closest to where I wanted to end up, it had a TV, and something about it just seemed... natural. Of course, I didn't think that through, it's just where I automatically went.

Then, after sitting for about ten minutes, I began to realize that the waiting room was separated into racial groups. I was sitting in a U of chairs entirely filled with Caucasian people, the one next door had Black and Latino people, and the one next to that had people of Asian descent. I noticed this, and it disturbed me... why are people doing this? Why does it just happen, with no noticeable intent? Why did I also subconsiously follow the masses?

A woman sitting in the U beside the one I was in had her name called. It wasn't her turn yet, but she was next. As I saw her walking over towards us, I thought "this is good, she's going to sit down. This whole thing was just in my head." But, she didn't sit down. She stood, just outside of our little section. Maybe it was just because she knew she'd have to get up again soon? I hope so.