It is important to not offend others.
John is upset that Eric is on his computer longer than anticipated.
John wants to vent his anger.
John asks Eric how long he will be on the computer and says he needs it soon and takes a deep breath.
John confronts Eric and calls him a bunch of bad names in a raised voice.
Eric is grateful for John letting him use the computer and tries to finish up quickly.
Eric resents John and doesn't feel badly at all for using his computer.