Personally, if I expect a comment or post to get negative karma, I don't make it. Perhaps that's too conservative on my part, but it's the case.
Me too. I remain as absolutely terrified of negative karma as I was when LW started. (In fact, it's possibly even worse now, since I have a reputation to uphold!)
Right now, I have a recent comment at -1, which for contextual reasons I can't delete, and it's driving me crazy.
(Yes, I know this is bad, and I shouldn't be like this. Unfortunately, I don't know how to change myself in this way.)
I remain as absolutely terrified of negative karma as I was when LW started.
I'm curious why you care.
A fun game you can play on LessWrong is to stop just as you are about to click "comment" and make a prediction for how much karma your comment will receive within the next week. This will provide some quick feedback about how well your karma predictors are working. This exercise will let you know if something is broken. A simpler version is to pick from these three distinct outcomes: Positive karma, 0 karma, negative karma.
What other predictors are this easy to test? Likely candidates match one or more of the following criteria: