I completely agree with you, especially considering that comment was posted in reply to the maintainer's also dismissive comment "this patch is boring", which to me makes it seem not as bad as if it were out of the blue...

I believe the Rust community has been trying to draw a line somewhat short of where systemd discourse ended up.

Those comments would also be over the line.

HN discussions do not always live up to HN ideals. This is not be used as a reason to drag others down to our level. Instead it should make us reflect on our own behaviour.

Indeed, and it's one of the reasons HN has the reputation as "that orange hellsite" in some places.

Just because something is common doesn't mean it's okay.