Curiously, a "lump of coal in your Christmas stocking" was originally a wish that you would would be kept warm in the coming year.
And then, I suppose, abundance ensued, and a cultural shift that this was a negative thing, uncool, a down vote, an insult.
If there was a bag of biochar in my Christmas stocking, I would know that someone worked their ass off to
feed my garden and pay me a compliment. Pretty nice.