You could kinda turn it around too: The races right now function just fine, adding more hairstyles (or manes) is an extra on top of that because the race can be played without it. Wanting that over the introducing of the missing genders is selfish in that way too. Its all a matter of perspective.
Also there is nothing wrong in being selfish.

Those that want more Ultimates or savages fights are also selfish, those that want more Eureka because they like it are selfish. As soon as you want something over something else its selfish but thats what requests are. So those wanting the missing genders before the other ones getting more hair are completely in their rights to want that too. They are not horrible people for that.
With the money they are making and the amount of people that are playing, both should be possible at the same time...if SE would fund their project better. So instead of fighting against each other verbally maybe we should hope that this game gets the budget it deserves.