I think it's important to share interviewing stories. Both for other startups to learn from, and for future employees to know what they're heading into.
Or is it not every manager's wet dream to have good guys right out of university who won't hide their true skills by being incompetent/nervous at interviewing?
Conversely, is it not every young guy's wet dream to be able to display their true skill in an interview, rather than mess it up by being bad at interviewing?
Where are they to learn if nobody shares the stories?
Also the job == relationship metaphor breaks down fairly quickly. What applies to one doesn't apply to the other just because you say it does.
What conclusions would you draw yourself, if you were about to hire this person and that post came to your attention?
If I was hiring and I googled the persons name and found this, I would perhaps be slightly concerned. Not alarmed enough that it on its own would sway me either way, but I would probably pay a bit more attention to the persons attitude in general. To me it suggest either a lack of courtesy or an overblown ego.
If you really dig into it, you'll find huge variations in pay for similar skilled, experienced, and hard working employees just based on who did the hiring, how much was asked for, and when they were hired.
When I was in college I had a job where I made about 50% more than most people I was working with--I didn't really work harder (everyone worked hard) nor was I much more skilled. I just negotiated a bit better, and was hired by the right manager.
On a scale of misbehaviors, this is probably far on the "good" end, but still. Who should gain from this post? If Airbnb, why not mail them directly? If he is "warning" potential hires, aren't he in effect hurting Airbnb? If he wanted to discuss hiring practises in general, why not anonymise them?
And a substantial benefit to anyone else who reads this and can make a more informed decision before deciding to interview at airbnb.