Banned no reason!

Hallo excuse my english it is not good. I think Blizzard is unfair banned me no reason! I new in server and look for nice people. I join this guild of nice people called "Naga should pick cotton" we have fun and but 1 day later I cant log on and recieve email from blizard

Account Name: XXXXXXXXXXXXXX
Date of Violation: 11/08/08
Character Name Involved: Firestrider
Type of violation: Racial Comments
Consequences for Account: Account suspended for 48 hour

I no racism I didnt do anything wrong wtf is this?

PS: The guild is gone too wtf