Stigma? One of the best ways to avoid stigma is to eliminate as many toxic judgemental people from your life. Minimize your conversations & interactions with such people & keep it strictly to the matter at hand. Those who won't take your word for it wouldn't do so even if you were accompanied by Dr.Asperger & HE pointed to you & said, "Das ist ein ASPIE!" They don't want to believe you.
I wonder what kind of attention these troglodytes think an Aspie wants? For most of us, attention is like Malaria: we'd rather AVOID it. When it comes to 'being special', usually, that is a euphemism for DAMAGED & SLOW WITTED: keep those perks rolling! An official diagnosis that is on paper (in medical files or in gov't records) could impact on an Aspie's job prospects should it be discovered. It can also impact on stuff like getting a mortgage or other loan or even renting an apartment or office should it come up in a bkgd check. Rather than seeing our straightforwardness, logic & precision as positive traits, all they'll think is Asperger's=Autistic=unstable=dangerous='retarded'=NUTS!!! THat is just the attention I need: keep that spotlight shining! YAY! people think I'm crazy!
I realize that for younger Aspies still living at home with parents this can be more difficult. Even with a 'legit' diagnosis, many parents refuse to believe that there's anything different about their child. They just don't want to hear it. My mother, for ex., realizes that I'm 'not quite right' 'a strange bird' & 'not like normal people' (all HER words) BUT she stalwartly refuses to believe I'm on the spectrum. Even though, when it comes to the desire to socialize or have friends, I'm so far on the spectrum that Simon Baron-Cohen would have a hard time finding me! She thinks I'll 'grow out of it' (I'm 47.) & that if she just badgers me enough with unwanted dull & uninspired utterly vacuous chattering, I'll be forced to become more sociable & SHAZAAM!!! I'll no longer be an Aspie (and I'M the weird one?!?)
With many of us, our unique looks, gait & behaviour result in some kind of stigma. If we manage to slip under the radar (good at NT drag) our reactions & interaction style might cause us to be suspect. Rather than always living with the worry of being 'outed', I've chosen to no longer do NT drag except on those ultra rare occasions where it is essential to do so.