a lot of people will turn you down (and, depending on where you live, can with impunity). it can be really deflating to have people turn you down, but i guess that's just the way things work sometimes. when i was starting, i called the seventeen nearest endocrinologists to me (everyone within a two-hour radius, an area with around 3 million people in it) and they all turned me down.
but the good news is that number 18 agreed to take me as a patient! he was two and a half hours away, and it was kind of a nightmare to arrange transportation, but it's still a success story more than three years down the line.
so, i guess, don't let one person get you down. there are more people, and eventually, one of them will either be educated or receptive to learning.