AITAH if I end a friendship because my friend keeps accusing me of being the reason she can't orgasm?

My friend Joanne (30s F fake name) and I (30s F) met in elementary school. She's mad at me for something I said when we were kids, and has been bringing it up with increasing frequency in recent months.

When we were 14, Joanne asked me if I masturbated. Unsure why she was asking and embarrassed, I said no. She claims the way I said it made her feel gross about it, so she never ended up masturbating until she was in her 20s. That was when she discovered she is unable to orgasm, according to her (she has never seen a doctor about it).

Joanne wholeheartedly believes the reason she can't climax is because of me "shaming" her when we were kids, and stunting her sexual growth. I told her I'm sorry if i made her feel bad, that was not my intention. I was an embarrassed kid who didn't want to admit to masturbating. I highly doubt that's the reason anyway, but she's adamant. Joanne assures me she's no longer mad at me, but it's important for me to accept blame.

I'm willing to admit it's possible Joanne's perception of me "shaming" her by saying I don't masturbate created a stigma for her that could be causing her to have difficulty orgasming, and I've told her this. Even if that's the case, I feel like I still shouldn't have to take responsibility for her problems (whatever that even means - she can't give me a clear idea of what she even wants from me).

I've gone low contact, and I'm considering cutting contact completely over this because it honestly feels insane, but it also seems possibly extreme to end a friendship spanning decades for something that seems so trivial from my perspective.

AITAH if I end a friendship because my friend keeps accusing me of being the reason she can't orgasm?