It's not okay to insult someone for what they do.
Samantha almost slips on the floor that the janitor mopped but didn't put a sign down.
Samantha wants to tell the janitor off.
Samantha tells the Janitor he could have killed her, and to be more careful.
Samantha yells at the janitor and calls him a loser for being a janitor.
The janitor notices that and apologizes, saying it's all his fault.
The janitor is offended, and feels lower than he ever has before.