Because that is who she is . She's Sam.
Sam is really mean to people because it is found comical to most people. As she does no real harm to people, her crude jokes and advances are funny to many. However, the girl who plays Sam Puckett...
well for more views and fans sam will say she loves him to and at the end of the episode theyll break up.
Sam isn't THAT mean on iCarly, just to Freddy because she doesn't like him. Remember, it's acting.
it was just a word he said to insult the Americans