"gender" has been reduced to characteristic traits, but that is not how it has always been. Historically, it has been pretty common for men and women to behave differently from one another, depending on cultures. So if a man has more similar personalities to women characteristics according to his culture, he might feel more like a woman.
But you see, this is not the definition of gender. Gender is based on what you are born as, and what body parts you have. Many people who are genderfluid have a character difference from their gender and want to fit in, so they switch genders, as one might switch clubs in a school. This is not what genders are, and not what they were intended for. Maybe we could have more effeminate men (which the Bible is against, btw), or more tomboyish women (which the woke culture has killed the existence of, tbh), but the hard truth is that their gender never changed. Gender isn't about feelings or sexuality.
This whole idea came from hundreds of years of misunderstanding the purpose of gender. Because cultures assigned expectations and characteristics to genders, we are where we are today.
I don't hate trans people, I actually feel a lot of compassion for them, as they tend to feel unlovable (especially once they've done the process). But the trans movement is a scam and I despise it whole-heartedly, because they advertise transgenderism as a solution when they know it makes things worse. Go look at stories of detransitioners or people who regret the process. A lot more ppl feel that way than are saying it, bc saying it makes you a transphobe and ppl will censor you so ppl won't see what you have to say. They're hiding this from ppl bc trans operations make them money. When you're talking to a trans person, you don't have to have any idea how they actually feel about it. The fact that pharmacies are willing to put children through this makes me very angry. Because as a decent human being, I despise seeing children suffer.