Is it ok to treat your best friend like crap?

You see my name is zack morris and i go to bayside high. I treat my best friend screech like dirt. I forces him to do all my dirty work. He lies and cheats for me and i still make fun of him in front of everyone. I can't believe he thinks i am his real friend. One time i even made him dress up like a cleaning lady and spy on the girls in the locker room. Am i a bad person??