If you don't want to be disappointed, fund better startups.
I've been here a while and that's never made HN great. HN is supposed a welcoming place for smart folks with an interest in the small intersection between tech and business.
It's always felt like an implicit rule, but it's pretty simple: don't be a dick, and don't discourage people from exploring ideas they think are interesting. What positive outcome could that possibly have?
Instead of "hating", what's the best possible motivation for these kinds of comments?
Alternatively, what emotions are behind them? What reaction can you have to those emotions that help the people who have them?
Disclaimer- I find middlebrow dismissal as disappointing as anyone. But I've found value in considering what underlies it.
Anyway, this is the internet: people will have a problem with anything you do so don't take it personally.