Yeah, I just think that is a strange standard for "harm". I dont think anyone would be harmed if they refused to serve anyone and every employee was idle. What if they dont want to double the number of customers and care more about something else.
I think it is best to approach interactions without entitlement. They dont owe you service, and can choose on which terms they will engage.
Your concept of harm reminds me of how some people think they are "harmed" if someone doesn't want to date them, becoming angry and aggressive.