> Quoting people to negate or mock their argument has been around since Usenet - well, much longer in literary terms but I'm citing Usenet as an example of a system that's almost real-time and where it can be a spontaneous emotionally driven decision. It may not be called 'dunking' on every platform but the phenomenon is universal.

It may have occurred occasionally on other platforms, but the difference in degree is enormous enough that it's a de facto difference in kind.