That's literally the joke.
I looked up Facebook IP address and tried to go there directly, bypassing the DNS. No response.
(I don't care about Facebook much, it was a test. WhatsApp though I have to use to communicate with relatives.)
The first place my mind went to after I read this was "dumb fucks" (Google this with Zuckerberg for context) but as good as the schadenfreude feels it doesn't change the very real and negative impacts from all of this.
I find it hard to find fault with people expressing disgust with how knowingly predatory and exploitative the company's leadership have proven themselves to be.
Exhibit A: https://www.bbc.com/news/technology-58678332
But maybe it's a failure with wider scope than just Facebook's DNS. Or an attack that targeted both FB and HN (and others)? Wild speculation at this point.