I'm gonna fuck over my friend.
Why are you going to ruin a friendship?
Because I don't like the way they greet me.
You are really immature to want to ditch your friends because of such a silly reason. You need to talk your problems out or just leave the friendships already. You don't deserve them all if you act like this, you're supposed to love your relationships.
I'm going to get my friend fired from his job until he respects me.
That is such a petty thing to do. You should not do this.