Why are half of the comments on Hackernews stereotypical AI-bros whose lives revolve around tech, and the other half sceptical commentators whose lives also revolve around tech but they are disappointed with its performance?!

Where are the normal people :/

"Normal people" probably does not fall in the ballpark of HN target audience.

I'd say its 50/50 pessimistic and optimistic, with pessimistic attracting more attention because of human nature.

The people in the middle are still waiting and see , mostly it’s the extremes that are fully vested and loudest on the internet

We are just reading the comments.

Why would a non-tech person be on Hacker News? Isn't the clue in the name?

Both parts seem pretty normal to me.