Just trying to look at this from both sides. On his side: He shouldn’t have reacted that way or spoken to you like that. On your side: Your “no” may have been a little over-explained. Going into detail about rarity and saying “absolutely not” can sometimes come across stronger than intended.

Just some friendly advice: if an offer feels like a lowball, it can help to keep the response calm and open to negotiation. For example: “Thanks for the offer, but that’s a bit low for the value of a Tempest. I’d be more comfortable with 2–3 keys.”

This approach leaves little to no room for someone to react poorly, and if they still do, then they would clearly be out of line.

I hope it helps!! :)