I see two things driving this from different groups, both negative:
- Jealousy over another person's wealth and easy life
- People who've never had much hardship or struggle thinking that all creative output is "valid" in the meaning of equal
The best response to most things you don't appreciate is to simply ignore them. No one's getting hurt from a book of frivolous photos. Nor are the number of photo books a person does or doesn't sell a real indication of the photographer's quality. Seems with young rich guys like this, the main product that is actually being sold is just an object for teenage girls that have a crush on him to collect. It's okay, we've all had embarrassing phases. No harm done, part of being human.