Overhauling my post here and voting to reopen, since the dupe has a status-declined,
There are no plans to keep showing negative scores.
Why? The "bug" doesn't appear to affect anything else. Why fix the bug that's actually causing something good? Oded (who no longer works for SE) said:
We want to let you know about good things as soon as they happen - that's what our real-time notifications are for. Negative reputation changes are... well... negative. So we are not in a hurry to let you know about them.
Your mistake. Posts that get downvotes should, in theory, need more attention than those lucky enough to receive upvotes (which has been said by at least four others). So please, SE, can we reconsider that status-declined tag (or just don't bother fixing that lucky mistake)?
Can we make it so a downvote, or other reputation decrease will highlight the Achievements trophy icon, or alert you in some other way? A downvote might mean there is a problem with your post such as being off-topic, ethically wrong, or inappropriate, and thus would warrant a bit more attention than the extra 10 reputation an upvote gives you. Could this also extend to a notification when you lose rep, say, because of a removed post where you had posted a well-accepted answer?