Gosh some really nasty bitter comments on here, I mean calling children disgusting entitled twats?
My daughter was privately educated from thr age of four. Her schools were excellent both with pastoral care and academically. In addition yes they had the additional facilities, from language, to music, to sport, to equaestrian. Class sizes were small. Always below sixteen and with a teaching assistant and teacher. The teachers were excellent. For the simple reason that like every other school, inc state, academic results matter. And you need good teachers to get those results. Good results is one of the factors that attracts parents to send their kids there and pay the fees.
Private schools are also ranked like state and they have also ofsted ratings.
Is it wrong people can or sometimes do have to pay for it and it's not available for others. Yes of course. Like everything in life from healthcare to clothing to food to housing, if you can afford better you can buy it.
Does it make the kids or their parents bad people. No. Does it mean every school is full of wealthy kids. No, plenty of teachers kids, bursary/scholarship kids, and plenty of kids whose parents scrimped and saved to send them there.
In my experience the kids don't care about other kids parents financial circumstances, they don't look further than the kid themselves. It's the parents who have these issues and sensitivities. Its never the kids themselves.