[jjnoakes]

I'd appreciate some examples. I'm not saying it doesn't happen, but in my experience downvoted comments tend to have something beyond a counterpoint or difference of opinion; their content is usually irrelevant or unnecessarily snarky or somehow hostile.

[hn8788]

I don't really have the time to go digging around for examples, but it's common enough that one of the site rules is to not complain about downvotes because it frequently happens for no reason.

[jjnoakes]

The comment author may think there was no reason but almost every time I see a comment complaining about being downvoted, I see a reason among those I listed above.