Earlier quoted context omitted.
1) If sexual preferences can be genetically predisposed or even predetermined, then sexual preferences can be selected for through evolution as well. This means that if giant butt feathers are destructive towards actual survival, then all the female peacocks sexually selecting for this otherwise useless trait are disadvantaging their offspring and every peacock in on this giant butt feather thing will be disadvantage…
But until that butt-feather-loving predator comes along, the definition of merit continues to be how big a feather you have sticking out of your butt. It is just that the definitions change once in a while. Nothing bad about that, but nothing good either.
A meritocratic society must still constantly issue its merit accordingly though.