I understand well what is said here. With that said, if you are at work, you do your work. Also, you should not be using corporate bandwith to catch up on your own reading agenda. Do that at home.
My annual performance review includes a category for "staying on top of recent developments in web development and software engineering." In light of that, I would not call Hacker News my personal reading agenda.
What he should and shouldn't do is for him and his employer to decide, not you.
You don't find it ironic that you are now telling me what I should and should not do?