Another woman chasing height gets wrecked.

You are correct that men are willing to fuck nearly all women that meet their standards but women are more selective. This is due to biology and evolution, sperm is cheap and plentiful and if pregnancy occurs the man doesn't suffer at all, in fact he has the option of walking away. Eggs are rare, can only be inseminated a few days in the month and when women get pregnant they are stuck with the foetus for 9 months, will risk their lives giving birth to it and then have to commit time and resources in raising it for the next 5 years. Of course they will have evolved to be more selective about who they fuck.

They want the best genes available to ensure their child survives and thrives in a hostile world, and that the man commits to her and her baby and helps protect and provide for them when they're vulnerable; these 2 roles don't necessarily have to be fulfilled by the same man.

Maybe that's why men do better overall in the dating scene

Depends on the ages we're talking about. Each sex peaks at different ages, because what makes them attractive to the opposite sex is different. For example, in the early 20s women absolutely have the advantage in dating, because they are in the prime of what men find attractive: youth, fertility, innocence. Men become attractive in their 30s because its experience, mastery, social status and resources that women find attractive and these can only be developed with time and experience.

The problem is that with most women going for the tall/tallest male, only ONE can actually win the competition.

It's called sexual selection. Women are giving their future children the best chances of survival by only having sex with the best male specimens available. This means that the tallest, most popular, strongest, most caring, highest status men get the bulk of female desire, and everyone else fights for the scraps. You can blame biology and evolution for that. They're comparing the men and picking the best, so it's relative. There's no hard and fast rule saying only 6ft men can procreate, it's just that in todays society 6ft is 'tall' and is a round number so that's what they use in discriminating for sex partners.

tldr: it's normal for women to be selective, our job as men is to be the best we can be, compete with other men, do not allow ourselves to be used by women and commit to only the most worthy.