> orange cats are almost exclusively male

This is also equally true for black cats as the genetics works the same for them too.

However, it's more that "female cats can be tortoiseshell" and thus the ratios will get somewhere around a 2:1 ratio of male orange cats to female orange cats.

Assume that you've got 50% tortie females, 25% orange female, and 25% black female... and 50% orange male and 50% black male. You can run Montecarlo simulations on that but it will always be the case that orange (and black) cats are predominantly male because of the smaller number of options.

There's also the increased visibility of the "trouble puffs" on a male orange cat (compared to black male) and so conformation bias of "yep, that's an orange male cat."