Why do people call other people nerds at school?

Don't know I had a guy like that in my class and I told him off I ain't here to kid with you so don't try your jokes on me. I was so straight forward that he basically thought I hate him. but that's me I don't like wasting time for nothing. he spent his time telling jokes while people are waiting for reply to question. once I gave him question and he started joking I cut him off and told him i give you an F grade for this project I need and answer not a joke.a nd the class went still . he answered the question direct. without any stupid joke. I realy have no idea why some people are that way

Mostly and let me say mostly people are called nerds if they wear glasses,formal clothes with combed hair... the typical look.If anybody calls a person nerd because of the grades,then the person is jelous of the marks.

Its because they feel weird about the guy. Its just they didn't fit the usual way other people live their lives. And because they have different perspective in life. They can't understand their passion in life.

i guess it is because they are insucure about it... like if they don't call others freaks, they are scared they themselves will be called freaks... they are just really insecure people!!! thats how i feel... dont let them get to you...