I'm more and more confused these days by the downvotes at HN, I found I need be "100% politically correct" for technical discussions here(i.e. nothing negative

I'm more and more confused these days by the downvotes at HN, I found I need be "100% politically correct" for technical discussions here(i.e. nothing negative at all, even for critical thoughts or neutral comments, neither is enough though, the comments actually has to be perfect positive), people are so sensitive these days, including me who actually cares about downvotes, which is a bad sign.