I think human beings have always varied in their personalities and behaviour and that is a good thing.
It seems to me that we are now less accepting of ordinary differences. Rather than kids being 'the shy one' or the 'geeky one' or 'the one who can't stand losing' people like to diagnose and medicalise.
I think a school system in which there are a lot of targets and assessments is not always helping.
There's also a conflict between this 'measuring' culture which children have to fit into, and an intensely child-centred culture.
The internet and parenting blogs also encourage a culture where parents are constantly hovering over children and worrying about their behaviour.
I think this creates a situation in which children are encouraged to think there is something wrong, when children are unhappy and when they struggle - and to be intensely anxious about how they'll get on when the future is so uncertain, and also in which white collar jobs tend to demand a lot of 'soft skills' as opposed to more traditional types of manual work.
I'm saying this in the context of a family where there is some autism. A member of my wider family is 6. They are non-verbal. They cannot use the toilet independently. They are very distressed by lots of everyday noises. They have no sense of danger and will try to run out of the house into to the road. Sometimes they will eat soil and put wood chippings and stones into their mouth. They have what was traditionally known as 'autism'.
I think they have almost nothing in common with some of the bright but shy young people I know, who have passed their exams and can function pretty well in most situations - but who are convinced their differences are a significant impairment - and who have been affirmed in this belief by others.