Not being attracted to short men and not wanting to reproduce with them is a personal thing. But going on record ridiculing them, saying bad things about them, mocking their height, that's not okay, and it's true that if it was done about their race it would be frowned upon, but seems to be acceptable for height.
I think that's a fair issue to bring up.
It also seems there might be real measurable pay-gaps, and that might need addressing as well.
I fully agree, and you can extend that to men being bald, and many other bodily aspects. I think in particular contexts it's fine to make the occasional joke but that's entirely different from making it a widespread thing.
For example, it's ridiculous to ask for an exact height. Height is a spectrum. By demanding 6" or taller, you can't seriously justify how somebody that is 5"9 is an absolute deal breaker.
Similarly, if you're not attracted to fat people, you could still consider somebody a little overweight. Weight is not a static quality.
You may be attracted to brunettes, but I would opt to see that as a preference, not a hard requirement.
My point is that "attractive enough" is a better strategy as all of these things are ultimately unimportant if the personality doesn't match.
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.