Mate selection is not and should not be institutionalized which means that you are within your rights to discriminate on...anything. Your criteria may be based on "taste", past experiences or downright prejudice. It is inevitable that as you pick a mate, you discriminate.
You can't stop that nor should you. We can however openly discuss criteria that are unhealthy, perverted, make no sense...in an attempt to open people's minds. Not to control whom they can date, rather to open up possibilities. People may be missing out a lot by being needlessly restrictive.
As old man I might provide a shortcut. Cliche as it is, character stands the test of time. What is somebody like? Select for that, the rest is a bonus.