Firstly it's true and real whether you tell people or not. Secondly, even if you do, most people won't understand. I think it's awesome how you take the time to explain to people because just throwing it out there isn't going to work. People who stigmatizes or treat you differently are probably just not familiar with what it entails. I am cautious to in turn, be understanding of people's reactions because it's mostly not intentionally hurtful but again, only cause they don't have a clue.
If you have been diagnosed recently it is understandable that you tell a lot of people. I also felt like shouting it from the roof tops because it was such a relief to be 'explained'.
Your point about educating people is a great one, the more people know the better the stigma will get and the more excepted it and us will become.