I want people to stop attacking nonbinary people who describe their genders in abstract, flowery terms. And I want them to stop dismissing them as “just teenagers who don’t know any better”, too.
You know why? Because cis people do the same thing all the time and nobody bats an eye about it.
Manhood and womanhood are associated with symbols, colors, animals, astronomical objects, mythological figures, a whole list of things that have no inherent gendered properties, and that’s fine. (A lot of those symbols are stereotypical, but some binary people still embrace them, while others have come up with alternate symbols that better reflect what being a man or woman means to them.)
If men and women can describe their genders in abstract, symbolic, poetic terms, so can nonbinary people.