Backhand Insult the Poster Above You
If a backhand compliment is a compliment that's more like an insult, a backhand insult is an insult that's more like a compliment. For example, I could say your backhand compliments are terrible. This is an insult, but it's also a compliment because it means you're a decent human being.
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(I'm pretty sure if you work that out, it becomes something positive)