i tell my 'friends' and accuantences on a need-to-know basis.
sometimes the topic comes up as to why i did *insert weird thing*, sometimes i lash out at ignorance about autism or said friend disclosed having an ASD to me.
also, one set of friends i told becouse i had a meltdown right before their eyes; lucky it wasn't violent, but i kind of completely froze up, making them worried about me.
in my experience, i get respected more when they know about my AS, since they then realise what i go trough to be around them; but actually telling usually produces so much anxiety that i need a good reason to actually do it.