Perhaps someone just went through some of your comments and didn't like them either. You feeling bad is probably not the sole intention of those downvotes. People will be more than happy to upvote some of your comments if they start being relevant to rationality.

I looked through some of your comments, and they're not equally downvoted. Some of them are upvoted. I expect there's some signal there if you're willing to look for it. Might not be a signal you like or care about, though.