Who cares? If you're not part of the scene there, why does it matter to you? If those people weren't in "silly" startups, they'd probably end up in silly corporate roles. Or even worse, they'd be unemployed and be another strain on the current system.

There are a lot of ideas you may find silly but others find interesting enough to spend their working hours to make a success. If you only focus on finances, tons of them will fail. If you look at the experience they'll have doing it, I'm sure some of them will find it was a success.

I've worked at a couple startups and I've worked at some big corporations. There are bad coders everywhere. There are bad ideas everywhere. There are also a lot of jealous people who apparently get bent out of shape because people who are not the best engineer ever are making more money than them and getting to take time off arbitrarily.

Instead of focusing on how much you think their startup is stupid, or how they shouldn't get time off because they're not as good as you (based on who knows what), why not just focus on what you have, what you do, and what you like? Stop living against them and live for yourself.