I mean we ARE a lot more common than uneducated people think. They have the “autism = unable to speak or walk normally” mentality instead of that one kid who likes to draw and listen to music.
We are more common than many thing. However, we also tend to self select our groupings. We are a lot less common than WE feel we are.
Basically, about 50% of my local makerspace are ND. That is way higher than the general populous. However, even within family, work, or random friend groups, I still see an abnormally high percentage. I basically self select for weird people and have done all my life. This seems to be common for many of us.