I'm not trying to "cancel" anyone. If anything I just wanted to point out his crappy behaviour here, and at most get a response from him. That so many people are more upset about how I handled this thread than a member being ghosted speaks volumes of the community here.
I don't think anyone here would argue that the polite thing to do is to have responded that he was declining the sale. As far as to why he ignored you would be hard to speculate, especially without a response from him here since we have only your side. Is he aware of this thread?
You have a right to feel as you do and create the thread but I have been on many forums since the beginning and usually a thread like this doesn't age well.
Honestly imo life is to short to spend energy on something as minor as what occurred.
Edited to add
I decided to research this knife ad causing all the commotion. I have to say that what happened in that for sale thread was not how you handle an issue. As others suggested probably best to lock this one up.