Of course; as with any interaction with service people (cashiers, flight attendants, etc), the vast majority of the people who have ‘problems’ have them because they are a—holes. But yes, being in a ****ty part of Miami would increase the odds too.
As for ‘cabbie problems’, your suggestion that I see/treat one class of hired chauffeur different than another is of course ludicrous. What you have forgotten is one of the key features (among many) that makes the Uber model superior: customer feedback.
Bad customer feedback causes financial harm to the Uber driver and thus the model incents good customer service. So it’s no surprise the experiences with Uber continue to be positive (two more efficient and courteous rides today)