While I doubt this actually happened, I'm still disturbed by everyone cheering it on absent any context that would make OP not look like a petulant child.
Quitting without notice doesn't require justification, fuck the bosses, whatever.
But for all we know, this manager had bent over backwards to stand up for their employees, or cover for them. Maybe this employee took advantage of that and was miserable to his coworkers. Those are just as likely as anything else, given that no further information was provided.
At least invent a backstory how this manager was dogshit or abusive, or the company was awful. Make us want to believe that you're not just someone with a persecution complex who's quick to anger and lash out.
We need to push for more protections like required notice and/or undermine at-will employment in various ways. I'm sick of corps having us over a barrel in every way.
As someone that might or might not have engaged in that sort of bold move cotton exit strategies literally mirroring the behavior I had repeatedly received from my corporate overlords let me say that it feels good on the way up.
Then your next job calls this job to verify your employment, finds out you quit without notice, and withdraws the offer
Edit: I get that no one cares that what I'm saying is a real thing that happens in some companies. Just know that it is and tread carefully if you're thinking about quitting with no notice period
Edit: Also no, it is in no way illegal in the US for your previous employer to reveal a basic description of the terms of your separation to future/prospective employers