Would having this girl sit on the back row be racist or logical?

I don’t know why, but I woke up thinking about this.

I was in Jr. High in the early 70’s. A black girl sat in front of me in health class. She had a big, giant afro. I could not see the board, the teacher or the sex movies. All I could see was Charlotte’s hair. I spent an hour every day looking at her hair. I want to stick pencils and stuff in it.
If the teacher assigned her to the back row, would it have been racist?