People are children and repeat what they hear. 15 years ago, I would spout the same nonsense about burning man because of what I read on digg/Reddit from the same voices you hear now. I then met a friend who convinced me to go and I had an absolute blast.
For the vast majority of people in the US, let alone the world, attending the event is almost impossible due to cost, time, materials, etc. - it’s much easier for people that live nearby and most people within driving distance, the views of burning man will be more in line with your views - nuanced and reasonable. If you have no experience and no contact with the regular folks who attend, it’s super easy to bucket people into all these groups.
The reasoning about waste and frivolity is total bullshit — don’t tel me your bullshit vacation to Murtle Beach is anymore eco friendly. Or your plane ride to Bangkok to become more worldly is “green”. Burning man is an event, a vacation. I went many times as a student, spending only about $2000 all in. It’s a relatively economical way to have a blast for a week.
Take $80 billion, divide by the number of households in US with children ~ 30 million. That’s about $2700. Anyone who’s a parent knows that doesn’t go far at all in terms of education expenses. Good luck privatizing education and funding it out pocket for $3k/yr. Complete idiots.