What is it with people? A two-part question.

Yesterday I mentioned to someone that I'd started seeing a chiropractor. He immediately began telling me all about his chiropractor.

PART I: Why do people think that I should see their doctor instead?

But the thing is, he wasn't really extolling the guy's virtues. In fact, he basically told me that he sees a really mean chiropractor.

PART II: Why would you think that if your doctor is really mean, I would see him? Why would you think that even if your doctor is the best doctor ON EARTH I wouldn't try every single other doctor - every single one - before I would see your meany-head? WHY?