Personal examples?
I guess maybe the letter from my deputy headteacher to my psychiatric hospital, informing them that it was clear to the school that I was always different from the moment I started there, but that the other children tried to be kind.
Having entirely different capabilities to other children throughout school — outstanding, one-in-a-thousand ability levels at some things, years behind at others, and teachers explicitly telling me it's not normal to be so good at some things and not be able to meet basic expectations for behaviour and self-care.
Being treated as weird, called weird, given cruel nicknames about my weirdness, in multiple unrelated settings as a child.
Being explicitly told as an adult that I'm not the kind of person you forget.
Being unable to manage even basic aspects of adult life and meeting with incomprehension as to why.
I could go on for hours.
Yes, everybody feels special and different, and sees other people's outsides and compares then to their insides, and feels that they're not normal. And then, most people who have the capacity to do so and take the time to think about it probably realise that everyone else feels like that too. Seems reasonable then to concludes that if they're not normal, then actually nobody's normal. And in a broad context, that's a reasonable way of looking at things
But when you bring the term "normal" into a conversation about neurodivergence and neurotypicality, and try to apply the same idea, you're erasing the exclusion and difference that neurodivergent people often experience. In this context, there's a normal, and most people are it, and I'm not.