This is one of several diseases in HackerNews. There's a whole spectrum of ways to disagree, all of which have value in the right situation. Here, a good portion of that spectrum has been lobbed off in the name of niceness and nothing more. Is it worth it? Decide for yourself. I say nay. Bonus disease: PG worship. Don't get me wrong, he's a brilliant guy; we're all here (directly or indirectly) because of him. But it…
I preferred to absent myself from here for a while after it got real bad (to the point of the first article commonly being a 2-3 year old essay that had bubbled to the top AGAIN), simply because I felt fundamentally outside of the norm here - I rarely agree with anything PG says in its entirety. Paul is a thoughtful enough person that I've never felt that it would upset him if I disagreed here, but I would imagine there would be a lot of people keen to argue with me until I was blue in the face about it.
An opinion is an opinion however, and we're all entitled to our own - I take downvotes not as a personal attack, but simply an expression of disagreement, be it with your opinion OR the way you express it.