When I was a boy, I was called a nerd all the time - because I didn't like sports, I loved to read, I liked math and science, I thought school was really cool - and it hurt a lot. Because it's never OK when a person makes fun of you for something you didn't choose. You know, we don't choose to be nerds.
My best parenting advice would be not to take the job too seriously. Teach your kids to be nice, and everything else falls into place.