Yes and No. As a helpful person, I try to always leave comments on Reddit that add to the discussion and I feel like I get upvoted more on HN than on Reddit. The downvotes on Reddit, across subreddits, for helpful comments never cease to surprise me. I should mention that I comment on Reddit way more than on HN.
For example, people on /r/bicycling are often very elitist and critical. It reminds me of HN sometimes. People on /r/pics are more friendly.