It's bad to belittle others who are not tech savvy.
Kramer is in charge of training a new guy, Harry to use the PC at work.
Kramer wants to explain how to log in.
Kramer shows Harry how to get into the PC, Harry fails to understand, so Kramer explains it in simpler terms.
Kramer shows Harry how to get into the PC, but when Harry fails to understand, he is mocked.
Harry understands how to log into the PC now and is glad to have someone take the time to teach him properly.
Harry feels incompetent and quits the job before he ever really had a chance to start.