Boy or Girl?

A random memory from elementary school:

On the first day of first grade the teacher allowed the students to sit where they wanted. The classroom was arranged in tables with 4 chairs each. Since we were still at the age where the opposite sex had "cooties" all the students automatically sorted themselves by gender.

After everyone sat down the teacher said, "Oh look. All the girls are sitting at tables with other girls, and all the boys are sitting at tables with other boys."

Then she noticed one child who seemed out of place. "Oh except for you!" she said to a long-haired child sitting at a table of boys.

The child mumbled something shyly. The teacher looked confused. "What? Wait, are you a boy or girl?"

He responded that he was a boy.

"Oh I thought you were a girl."

The poor kid was screwed from day one.