[normtwofinger]

I've worked in retail and on a few occasions we had to ask some very unreasonable customers to leave and never come back.

For one particular service (autotrader) we only accepted credit/debit cards. Had one guy threaten to call the cops because it was unconstitutional to not accept paper money. I don't know, he could be right, but I was just a minimum wage worker doing what he was told. Owner told him to take his business elsewhere.