Is this modern classroom management?

I could use some insight from the teacher-y crew. I've worked in C-Monkey's kinder class twice, and this has been the case both times.

There is a little guy in the class we'll call Dustin. During the time of day where the kids are all working on projects at the various tables, he is up and about with the rest of the class. But during rug time, he is all alone, at a table clear across the room, and is even facing the opposite wall. The rug is on the other side of the room, behind a room divider, and the teacher sits with her back to the divider. There is no way Dustin can even see the rug, much less see (or hear!) the teacher, because he's about 15 feet away, and facing the opposite direction. This is the time she's reading books, teaching letter sounds, etc.

My heart is breaking for Dustin. He's not nearly the naughtiest boy in the class. He's a typical squirrely little 5-year-old boy whose teacher has isolated him to the point of his not being included in her teaching time. I don't know why this is happening, and I don't know if it's my place to ask her about someone else's kid's behavior issues. But my heart breaks for Dustin, and I need some advice...