i was diagnosed recently (i'm middle aged) and i've since learned that people on the spectrum get along better with other people also on the spectrum.

when i learned both of this; it reminded of me of my childhood and how other children who existed on the non-communicative portions of the spectrum gravitated towards me despite me never trying to form a relationship with them. in all of these cases the parents of the child pushed school guardians and took action themselves to keep their children away from me and the only reason i ever heard was that they were afraid that their child was going to be hurt because i could never understand what it was like to live on the spectrum.

if you want your child to have friends and you can see that he gravitates towards another child who seems neuro-typical: encourage it through that child's parents. also: if they're anything like my parents; they would have been insulted at the suggestion that i was on the spectrum and banned me from ever associating with your child, so don't mention that that's the reason why you're doing it.