What is good super market etiquette?

Rio Grande - What is good super market etiquette? Is it bobing and weaving in-and-out of an aisle so as to keep the folks behind you guessing what you'll do next? Do they have a duty to wait for your decision whether to go where you committed to go, or do you have a duty to look before you re-enter an aisle's "traffic"? Is wising-off to someone's well intentioned rebuke by countering with a claim of "speeding" fair? What, pray tell is the "speed limit", and how can same be measured? Well bud, please don't try to harass a well-intentioned shopper next time. He might have a bodycam on.