They don't trust you enough to tell you what they really think. Here on HN you get a downvote. IRL, the "downvoter" may get really vindictive, and if you aren't

They don't trust you enough to tell you what they really think. Here on HN you get a downvote. IRL, the "downvoter" may get really vindictive, and if you aren't out of his reach, socially and physically, expect some real repercussions.