The nice thing about stuff like that is it makes it pretty explicitly clear who you should avoid working with.

Exactly. Life is too short to work with such self absorbed people.

I find it somewhat sad. I've seen a bunch of former colleagues posting more and more of that bullshit as time passes by and they don't get a job.

Knowing them, you can see they are desperate, and that's why they follow the spiel to get "noticed" on LinkedIn.