I don't know how else to explain it. You said you really wanted to have a better understanding because of the world your son will be living in. She provided some charts, which may have took some time to download/screenshot, but she took the time to find it for you because she said she couldn't really explain it.
You then stated you still didn't understand, so she offered an option to maybe read a few books, but then you declined.
I'm not saying you can't not change your mind, but it's just a little aggravating especially for someone who is sensitive and aggressive when it comes to those who choose to live and identify as something not of the norm to most. That is the reason you asked her in the first place.
That's all I'm saying. I don't know how to give a better explanation than this one.