You can’t deny what she likes ; what you can do is ask her to explain: what is it about it that resonates with her? Can we sit down, turn the volume way down, and spend a few minutes checking out her fav’s in that style while she tells you why she likes that stuff?

(The subtlety here is not asking her to justify herself, but to explain to that out-of-the-loop, quite-geriatric Dear Bro)

Her answers don’t matter much - what matters is asking her to view the topic critically, and verbalise it that so that you “get” that side of her.

Also, “I love you but I fucking hate that shit” can work you know.

Good luck.

By taking care of her. Take initiative, propose movies / games / ice-creams whatever. Things you like, things you think she’ll like. She’s having a hard time reaching out to you, do your best to reach out to her.

It’s not your fault, but it isn’t hers either. Try to have fun together, she’ll get to know how you work and you don’t one step at a time.

In short, like anyone else:

He’s absolutely right, and utterly annoying