That jab is just a small part of it, his post is still really good and he isn't derailing. I agree with positive rep being a way of avoiding clutter and negative rep being a way of calling someone a dickhead in 20 pixels or less.
I suppose negative rep gives us a way to say we disagree without having this real strong opinion or explanation why, or sometimes when a heated debate is going on and we disagree but not directly involved.
But people do abuse it and they should have the ability taken away from them. Its the problem of a few ruining it for many
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