Worse of all its just not nice, you might have inferred from his comment he isn't qualified to x, what do you think people inferred from your comment, about you?
On "disagreeing being one" - looking forward to your comments ("Fed up") on each thread of HN. It's human nature to differ on views, and express alternate opinions, and that is of value.
Regardless, my point is that yours did not add any value to the conversation at all, it did not leave an open door to discuss the state of the labour market, or ask "hey, are you saying that from experience?". Worse, you called someone you don't know unqualified.
Even if you happen to be the labour minister of Denmark, you still should have tried to add value to the conversation.
Edit (and last I'll say): "It's human nature to differ on views, and express alternate opinions, and that is of value."
DUDE - If thats what you'd done, we wouldn't be having this conversation. You didn't offer an alternate opinion.
Anyway, that is all. Have a good day.