It's almost impossible to believe but there are actually people who are convinced everything in nature is binary: either 'this' or 'that'. But that thought is simply false. For instance: nature in no way looks anything like on the 'one hour photo service' pictures of the late eighties:
The sun just isn't always the same shade of yellow and neither is the beach. The sea isn't always the same colour green, the sky isn't always the same colour blue and people in real life are never either pink or brown.
Not even for those who desperately want that to be true.
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Just think of it: why are most aliens you see on tv neither male or female? The only exception I can think of - although there are probably more - are the so called 'Predators'; those fighting 'Aliens' on Earth all appear to be male. Although rumour has it that female Predators are just as ruthless.
Back on Earth there are all kind of gender-combinations with a ginormous mix of characteristics.
Extremely scared and conservative people are terrified. And they live - like young children like to play - in 'the upside down world'. So people who believe in science they call 'woke'. While they themselves squeeze their eyes tight, put their fingers in their ears and go 'Nah nah nah!'
Why do you think some people think there are always only two genders? And why are they terrified about there being more?