This exists because there is limited courage to call this out. There are not many polite ways to tell someone this, you would need people in their life to pull them aside and point it out. It's very similar to being the friend that pulls someone outside and explains they need to brush their teeth (someone has to do this, with love). Maybe more working professionals need to blog about this so the broader community can be educated on behavior when it comes to excess vanity and general manners.

For example, it's simply rude to broadcast your new job when some people are struggling with it (will they ever get one? will they get fired? are they good enough?). Just the very fact that there are "some" should be enough to kickstart one's manners, even if that "some" is not a lot of people.

It's simply rude to continuously market things (anything) when there are people literally ... stressing themselves over the pressure of competition. Again, as an example, a person constantly marketing their looks is putting stress and pressure on many others - this is a simple fact. The same goes for those with wealth and opportunity.