I do agree it's a typical teenage/young person thing to think you know it all and rant on in a woke (/what we used to call "right on") manner. And that's always been so. But I do think it was different in the past in that you didn't expect to be given the power to silence all other views. We may have thought we were righteously right, but we did know there were other views and understood that debating topics with people who disagreed was a thing. We all saw the danger of being Rik off the Young Ones and knew he was ridiculous.
Older people might not be 'versed' in feminism?
That's quite telling that she thinks it's about being "versed" - told what to think and having all your correct slogans and pre-trained views to hand.
The thing about being an older woman, for a great many of us, is that our feminism isn't versed, it's a long hard journey that we look back on, in which decades of experience has shown us how misogyny works in a million ways, and what it does to relationships, to girls, to society. As women get older, they tend to grow and mature away from needing to be liked and trying to centre men, as the sexism in our upbringing gets replaced by clear-eyed cynicism about relationships and understanding that we can centre ourselves in our own lives. That can happen whether a woman is self-consciously a feminist, or just going through life and dealing with all the shit without that label.
That is why older women can help younger ones, even when we see that they're naive and disrespectful and think they're right - and I have been helped by so many older women in my life.