@olly91 It's sounds like these are the things her parents may value.
My younger sister is materialistic, self-absorbed, and can come off pretty rude. Her daughter (niece 1) has fancy, expensive purses, they get a new, leased car every other year, and she's active in tons of expensive extracurriculars (dance, gymnastics, cheer, areial sports, etc). To afford all this, my sister does not save any money, often asks for loans from family, is always doing a "fundraiser"... It's insane.
In comparison, my younger brother's daughter (niece 2), just a few months older than niece 1, has been raised with more focus on appreciating what they have, and each other, and not focusing on the fancier stuff. She does one sport at a time, usually through a city program. Her mother is extremely creative and uses sales/thrift stores to create great outfits for the kids, etc.
So, while niece 1 may say, "look at my purse, or was $350!" Niece 2 would say, "look at mine! I got it for $2!"
It's just where their parents place their focus.
One thing I've realized is kids are hella impressionable. I have always taken my kid thrift shopping. Last summer, for back to school, we took one of his buds with us. For clarity, both are AFAB, and both were females presenting, but eager to move into more masculine clothing. They picked out shirts, pants, shoes... Just everything they could need. They loved getting to try more masculine stuff without spending hundreds of dollars. It also have them a chance to figure out what styles they prefer. When we were finished, I took the extra money and we introduced the bud to Indian food.
That kid had never done those things before. Now that they have, they consistently ask to go again, next time we go.
It's okay you don't like the friend. We can't like everyone. I'm just saying, you may be shocked by how much influence you have.