i mean historically the answer seems to be that they aren't worthy of basic respect and dignity, no

I'll add that anatomical variance is in the introduction chapter of any decent anatomy and physiology book.

Have you met many?

I feel like this statistic is probably taken out of context. Like if you look at all of earth it's probably true, 1.7%. of people being intersex and 1-2% of people having red hair. But in places where people actually* have red hair such as northern and western Europe that goes to 2-6% and reduces to basically 0 in places where people of European heritage don't live. So basically what I'm saying is if you live in a place where you regularly see people with red hair you are probably seeing them more often then you are seeing people who are intersex. And the opposite being true too if you don't regularly see people with red hair you see intersex people much more often. Overall I think it's unhelpful in giving a realistic idea of the comparative amount of intersex people.

except it's not even a continuum it's more like a fucking pick and mix bag

You’re kind of missing the point.

I'm making fun of them by pointing out how they're wrong

It’s an easily falsifiable statement.

Yes

It’s an incendiary statement designed to foment division.

Yes

Everyone knows there are more than 2 genders.

Actually no, not everyone knows. You'd be surprised how people are ignorant to these matters (by choice, or repressive environment)