I post on here occasionally, name changed recently, but have posted about this before.
I have not adopted and nor have any of my friends, but, we have children with 'hidden'' special needs.
I think kew's post is brilliant about the whole, 'they all do it' issue (my mil is a particular offender).
I think the difference is in degree and impact which is hard to quantify and I hate hearing myself justify the differences.
I do have a point (in fact 2, honestly).
Firstly I think that other parents of special needs children will get it much more than other parents. We don't think we have any answers, we never think its down to your parenting, and we get that it's really, really hard. At most we suggest the occasional tip, that made a slight difference for us, and that you might want to try, if you think it might work, at some point in the future (I.e no pressure, no suggestion of 'solutions')
Secondly, in my, and many of my friend's experience, though to be fair not all, pre-schools are crap at this stuff. DS1 has social communication difficulties, probably high functioning autism and probably add (though the dentist who saw him for 10 mins yesterday assured me he was fine
!
Pre school first of all denied there was any problem, then told me that non of the other children bothered talking to him any more, because he never answered,
and then that they had fixed him!!!!
His, very good state primary, got it from day 1. Getting the support he needs is another issue, but at least they get it and are doing things to help him, they listen to me about him and really see his issues.
I don't know if this helps at all, but just wanted to say there are people out there who will get it more than most, even if they haven't adopted.