Is “I won’t buy this car if you don’t give me a discount” a threat too?
Let me add some more double negatives in there.... It's not not a threat to not keep quiet about intention to not not cause pain to another person.
I don’t really care though. Call it whatever you want.
The way I read your response is "you must buy my X, otherwise you're negatively impacting me already" and it's something turned on its head.