As I recall, I started watching Hill Street Blues at the urging of Barbara Fowler, who worked in the same office that I did. She thought it was a show that I would like. And I think the first episode that I saw was season 4 episode 2, which happens to contain this classic Belker scene.
In most episodes Mick Belker went undercover in a different venue. In this one it’s a fish and poultry market and he encountered a rather demanding customer.