I understand the frustration. It is difficult to communicate your feelings or struggles to people who either dismiss your experiences because their understanding of Autism predates current knowledge-or, worse, is derived exclusively from popular culture-or belittles them. I have encountered the same problem with Tourette's-people's ignorance of the disorder, I mean to say. Just as Autism brings to the average, uninformed mind "Rain Man", it is coprolalia which the average person equates to Tourette's. I have a small lecture-generally not exceeding two minutes-prepared for those who do not understand Tourette's very well and have had to recite it many times.
Have you perhaps thought of making a Power-Point which very briefly explains ASD and then emailing it to everyone mecessary (wohever they may be) so that you can refer them to the power-point if any annoying statements arise? It can be very fun gathering information on a topic and organizing them upon a Power-Point. It is even more fun writing essays, but most people do not like to read essays and instead prefer concise presentations.