Hmm, very different perspectives; personally I think a big advantage of reddit over hn is that on reddit, if I see harmful bullshit or toxic garbage, I can do something about it without having to take up everyone's time. I don't downvote based on mere disagreement; surely there are some people who do, but I haven't seen that much of it.

That having been said, I mostly read the programming section of reddit; I'm prepared to believe standards might be lower in e.g. the politics sections.