you cannot make anyone understand. some people WILL not believe the less severe cases of autism are that, and chalk them up to behavioral issues that are either partly or entirely within our control. Dealing with these people is not difficult for me because i have had to do a similar think in relation to atheism, an ailment I have had for more than a decade, whereas I learned of autism only in the last couple years. The realization is the same, some people REFUSE to understand. They have their own idea, and it is not open to discussion or evaluation. My mother is in denial of my autism diagnosis (self diagnosis so far) (though she interestingly told me about a teacher i had in elementary school who thought I had aspergers, before i ever mentioned my own findings), my mother is also in denial of my atheism, she constantly discusses churchy subjects as if i have never told her anything about my personal beliefs, they are simply not valid, ergo nonexistent. Didn't mean to turn response to your issue about me but these are examples of my point, that this will occur to you again, and likely in relation to numerous other things independent of your neurological condition. If it is strangers that refuse to understand it can usually be easy enough to move on, but it definitely sucks when you have to hide or not mention part of yourself around people that have to be part of your lives, such as family members. Suck as it may you just have to accept you will have to attempt to censor yourself around these people. Sad for them but it is their choice.
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That is not dead which can eternal lie,
And with strange aeons even death may die.