I'd give it another chance though, sounds like the work is fun and maybe you can communicate your concerns to your direct manager.
My skip-level at my first MAAAM job used to snipe at me when I was a new hire. He told me to my face he "would not have chosen me" and "didn't know how I got in." It made me so angry it was all I could do to hold my tongue until I got the fuck out of his office. But I went on to become very successful there, and he eventually had no choice politically but to support me. He got managed out a couple of years later.
Holy shit. Glad that this person got managed out... eventually.
A good manager would not say stuff like that unless he really felt the person would take it the right way. A bad manager will say stuff like that to stroke his own ego.
So those are absolutely different sorts of relationships. The coach is not your superior so it changes everything about what they could say to you and the consequences it could have on you.
So no, a good manager should never say stuff like that. It's the sort of words that can be the involuntary sparkle which could ignite depression or even suicide. And for what ? A better performance at writing crud programs ? No. Professional things are not important enough to say any of this.
Or is it something else?
I immediately hate it.
Not sure if it was meant to be a good job, or a "you're lucky."
OP, I’d say keep this situation in the back of your mind and reevaluate in a few months. If it happens again, start the job search.
I think it's a sign of bad company management, but it's by no means a dealbreaker. i.e., not something to quit over.
But both of them always filled each other in, and it was never about any performance issues on my part.
I also got the impression that the manager's boss was venting... presumably they were feeling some pressure from elsewhere to deliver the project. Not a great sign that they took it out on the junior, but this would normally be the job of the middle manager to deflect / explain / shield the junior from.
To the OP: try to not take it personal, the manager's boss was almost certainly venting their own frustrations and "taking it out" on you. Very unprofessional but it happens. It's very unlikely to be a real reflection on your performance. Try to take it as a growth experience to build a bit of "thick skin". You shouldn't have to but it helps to have it (especially if in future years you become the middle manager who has to absorb the venting). Hopefully your direct manager will give you more useful feedback on your performance and perhaps explain the boss's frustrations.
Like, why are they complaining about this on hacker news? They should be venting to their manager (we can see why that fails), or some engineer with some clout they trust. If they don't have these avenues, that can turn sour quickly.