From the article:

> It's almost as if, once you get to a certain level of power, you no longer need to try.

It’s relative to the power level difference between the two parties.

We’re talking about someone (your boss) who doesn’t really need to present an appearance of professionalism to their proverbial lowly underlings.

As slapdash as their response to you might appear - if you were to observe that same person composing a reply to the CEO, I'd wager that all the hallmarks of grammatical precision and professionalism would be back in spades.