At least that's what happened to me.
I have been happily sharing my thoughts with a close relative for years, thinking we were both on the same page, both liberal, etc.
Then today, when I mentioned a past problem dealing with transmale issues, she suddenly went off on me.
She began screaming that there are only men and women, and that I was just blaming some personality trait on being "trans" but that it wasn't true..everyone is on the gender spectrum and transgender people are whining about society not accepting their particular gender mix.
Then she began saying that I was trying to get an operation to turn me into a male (I'm not..I'm non-binary and only dress androgynously) just because of my personality problems, and that's all that being transgender is.
She then went on to rage that I'm just some loser living in isolation on some island because of personality problems, something about being born under a bad star sign, or something.
I was taken aback and tried to explain that I live on a peninsula in a city, and that trans people are born that way, but she cut me off, saying, "Yeah, yeah, so you've TOLD me!"
This tirade was so unexpected, and so violent, I quickly said I had to go, and hung up.
But it did occur to me, that just because someone seems to accept you, it doesn't mean they actually do, or that they won't change their minds later on. But it doesn't really matter. I will continue to be myself and live as I do, so if people have a problem with it, then it's their problem.