I have been unfairly downvoted before, but it’s just not a common occurrence. The most common way things go down are that a positive comment gets a few upvotes, once in a while gets dozens or hundreds of upvotes, and once every blue moon gets as many as 3 downvotes. On balance, positive comments have been an extremely high ratio of ups to downs.
> Why would I participate in that?
This is a good question, but you’ve constructed a straw man version of HN where everyone is against you. I think if you come at it with less fear and more curiosity, you will have a much better experience. Maybe spend more time reading without commenting and go out of your way to take special note of the positive interactions. The reasons I participate here are for the technical articles, for the wide variety of good advice on how to start and run a business, for the threads where world experts and relatively famous people participate and comment, for threads about things I love like GPUs and computer graphics, for retro computer history, and sometimes for adding comments where I hope to help people see the glass half full side of things. Good luck friend!