Negotiation can also be boneheaded and incredibly stupid. I went to a car dealer who was asking me for $4k over their own advertised KBB value (this was before covid too). I countered with $1.5k over their own advertised value. He insisted "we can't possibly go lower" than the list price. So I noped out of there.

Months later he texted me out of the blue and offered me the same price minus $600. That car sat on their lot for years.

Not all offers should be considered valid. Sometimes, an offer in negotiation is clearly, plainly, an insult to your intelligence.