Making an offer then decided to mia on it. The least you could do is to inform that you're not interested alr.

hey babe, you don't know me but I was a potential buyer for massive-clearance/ suitcase-kid (whatever she has changed her name to) and I suffered the same treatment as you. I would just like to tell you that you are absolutely gracious as to only leave her a small negative feedback despite her being petty and writing such a ridiculous feedback for you. carousell is prettier thanks to folks like you. cheers!

Offered $2 for a $3 dress and didn't reply until now, only to cancel offer. :( reply: sorry if it sounded like a threat :( It really wasn't... I just meant I would leave a negative comment.

Hi! It's a pleasant experience to do the deal with you =) thanks for the support and I hope you like the clothes! She's a fast and decisive buyer. No prob with the deal. hope for future chance to deal/ trade again! =)