Based on the comment you still have on that page (https://news.ycombinator.com/item?id=31087247), I'd guess the issue is your phrasing. "Like what?" can be read as aggressive. "All I can think of" can be read as dismissive. This isn't to say that the downvoters are necessarily right, but you might consider paying more attention to the ways you phrase things to avoid misunderstanding.

For an even stronger example, consider the way you phrased this post: "Why are trolls downvoting my questions?" You'd probably get better responses with something that accepts the possibility that the downvoters are not trolls, but simply mistaken. Or possibly even right! I would suggest the more neutral "Why are my questions being downvoted?" if you are looking for honest advice.

Comment of yours from the thread you linked:

  > > I feel so happy and excited just thinking about the possibilities these techs are going to bring.
  > Like what? All I can think of are the poor art students who I guess we should pay for their educations and will never have careers?

Sounds like you're not only asking why it is exciting, but you're also making a useless, mean, possibly offensive comment about art studies.

Why did you need to say "poor art students" and "will never have careers"? Certainly, the HN crowd don't like snarky/mean comments like that, it's why it's in the community rules.