This is actually a well studied phenomenon. I wrote about it ages ago. The studies went something like this:
Person A given $10 - happy and grateful
Person B given $2.5 - happy and grateful
Person A given $10, then moments later has $5 taken away - disgruntled and annoyed
Person B given $2.5, then moments later given another $2.5 - incredibly grateful.
Human beings, we respond more emotionally to negative events than equivalent positive ones. It's built into our fabric. Some say it was a survival evolutionary trait since spotting your enemies early was vital.
I'm no exception to this of course, even though I'm aware of it. . I was pleased to be on a large Orca's auto-upvote for months, but not very pleased with what seemed like an auto-downvote campaign from a whale.
My example is not actually a great one, since the downvotes are actually personal, but you get the idea.