Don't be too discouraged. You may note that SkyMarshal's comment is back in the black, no doubt partly due to your and my upvotes. (Or at least it was, now it's gray again! <sigh>)

It often happens that a comment gets some initial downvotes and then bounces back. In some cases, this can even be from fat-fingering on a mobile device. I've accidentally downvoted comments more than a few times, so I always try to remember to check whether the header line changes to "unvote" or "undown".