Did you not see how downvotes are used here? To show an example from today:
https://news.ycombinator.com/item?id=49977612
It is clearly their opinion, but it was downvoted heavily. Doesn’t help that he is pro AI.
What else are downvotes for other than to express disagreement?
It seems like there's a difference between an "opinion" about the facts of the world (like the article you are referring to) and an opinion about subjective experience (like whether something is "fun" or not).
It can make sense to disagree and argue with the former, but for the latter, having different subjective opinion doesn't invalidate or contradict the original.
(In my opinion.)