You’re saying these people were able to understand one of the major aspects of their make-up and were able, after years of struggle, to at least give a name to the reason for the struggle they still had to deal with.
They must have had some sense of relief when they got diagnosed. Perhaps they thought they would be given a little bit of a break by those who expected them to act like people who are literally not like them.
Perhaps they found, though, that despite finally being able to show others that they weren’t just lazy, or stupid, or that they didn’t care, or they weren’t interested in paying attention, or they were just being weird, they were still expected to somehow ‘snap out of it’ and be like people who weren’t like them.
After not being able to explain your behaviour for so many years, and then being expected to just somehow ‘identify and understand’ and gain some ‘deeper understanding’ would sound to them exactly like ‘you can just try to stop being yourself now you have a label, right?’
It’s exhausting. Even with - and especially with - those you love and who you see every day, including those who are on the spectrum themselves, there is still a lack of understanding and a pressure to just ‘fix’ yourself, and do so consistently.
No wonder some, as soon as they get a diagnosis, default to saying ‘I did that because I am X’ and don’t want to have to bow and promise to work on themselves so that they can be a better - different - person. They are doing this every day because they feel the weight of society. They don’t need to have those closest to them be the nagging voice of that society.