Do you bother trying to “convince” friends about your diagnosis?

Late self diagnosis here. I’m 49. My bff since 5th grade, whom I suspect is also on the spectrum, does not believe in ADHD and ASD and other disorders. I was discussing my own experiences and I was trying to convince her that these things are real and not made up but she’s not having it. I eased out of the conversation and kind of feel frustrated a little bit.

Does anyone else have this kind of situation where someone doesn’t take it seriously like? What do you do? Just let it go?