Like it or not, YC signals some sort of vetting (by PG, at the very least). It's a good thing for YC if people give YC companies the benefit of the doubt (it would be worse if people expected the worse or, even worse, decided not to work for those companies)
2) steered the company ... a matter of perspective.
He made it clear that it was from a strategy perspective: "steer the company in the right direction from a strategy perspective." And based on how he explained it, I suspect PG would agree.
3) they thought that a whiny child, that you are
There's really no need to sling ad-hominems. Not all startups are perfect. Many have issues, especially cultural issues. To deny it only reflects poorly on you.
The issues that the author presents is consistent with stories I've heard from others. It's not that people are bad, but when push comes to shove startup founders are willing to do what it takes to succeed.