I don't see what's to get het up about. They earn well - that's allowed. Presumably pay the taxes they're required to - that's allowed. Live a lifestyle they choose within that income - that's allowed.
Other people have smaller incomes and choose to spend more - that's allowed too.
I'm not full on FIRE, but I really enjoyed the book The Moneyless Man. It's about a man who chose to live without cash for a year. Whilst I don't want to do that myself, it's definitely a healthy review of what we consider essential spending.
My friend went self-employed and now puts her full 60k into pensions a year plus other investments, has fab holidays and so on but is still tightening her belt in various ways. Still lives in a very ordinary house in a cheap location when others might have moved.
I'm going self-employed myself, and would consider myself a fool if I couldn't talk to her honestly about work and investments just because she has more than me.
I think it's good for everyone to challenge their perceptions on what they can do. I'm still proud of the fact that I told my friend she was Cambridge material - she scoffed, but then she went, and is now a highly paid lawyer!