You earned -30 reputation today on ...
The above doesn't sound right to me. It appears as the tooltip in the "recent achievements" dialog:
Can this please be changed to something like:
You lost 30 reputation today on ...
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You didn't lose reputation. None of the previous votes which increase your reputation were taken away. You earned negative votes:
earn: to merit as compensation, as for service; deserve:
Yes, there are other definitions of earn which only count gains, but the existence of those definitions doesn't preclude the use of the correct definition.
You earned those negative reputation points. In the database rows were added with negative reputation, which were then added to your total reputation.
Whether your reputation increases or decreases is irrelevant.
Thinking about reasons ones rep might decrease: (Too long for a comment)
You have earned this loss of rep through your failures. You (theoretically) deserve it. Though it might not be so nice to point it out.
You have spent/expended rep.
You have lost the rep, it is misplaced, and go to you through quiet possibly no fault of your own.
I guess there is no single empathic verb. Changed works though