I'm lowkey bugged by it because they're also gendered sterotypes. Orange and black are carried on the X chromosome, so XY kittens with an orange X frequently come out orange, while XX kittens with one orange and one black X typically come out with the variable black and orange coat of the tortoiseshell or calico.
So effectively, this means that tortoiseshell and calicos are 99.9% girls and orange cats are 85% boys.
And then, totally coincidentally, people went in hard on stereotypes where the mostly-boy population are sweet dumb himbos, and the girl-population are moody, emotional, and prone to overreacting.
When these cats are not different breeds or geographically separated populations at all; this is a common coat colour for cats all over the world, and oranges and tortoiseshells are frequently brothers and sisters. Or parents and children. A tortoiseshell/calico mother will often have orange boys and tortoiseshell/calico girls; getting a tortoiseshell/calico cat requires one parent with an orange X, which is frequently an orange boy.
When assessing behaviour and personality, a major thing psychology has had to fight against is demand characteristics and confirmation bias. Having a preformed conclusion about how somebody is will lead you to interpret all their behaviour in a way that confirms your original theory, and your preformed concept of somebody can lead you to act in ways that unnaturally evoke that response in their behaviour. I have not seen any study on "tortitude" or "orange cat behaviour" that fails to rule out these two factors.
I normally shut up about this because people are entitled to their own silliness and having fun with their cats, but I'll be honest, the gender of it all just bugs me deep down.