"Popcorn" as a metaphor for drama is a daily in-joke at SubredditDrama, where that comment was posted. What kn0thing didn't count on was that a lot of readers had never been there before and instead took it at face value.
I believe it was the opposite, people got outraged because they got the exact meaning of the joke.
People were expressing loud and clear their grievances and one admin response was in the lines of "we know about it, let's do nothing and watch the drama unfold, it will die down".
That's a fair point, but if you read the article, it reads like a post-mortem: "this is what happened, this is why it sucked, life goes on, let's try to not do this again."
Maybe competing websites (Voat in particular) got a bump because of what happened, but at the end of the day redditors aren't an activist crowd (or rather, they are a slacktivist crowd.) I doubt this will have any big consequences.
I just saw it as someone throwing out a joke in the middle of handling a stressful situation. Reading his retrospective post on the matter, it sounds like he'd been trying to understand and address the situation all day and hadn't realized that the userbase at large didn't know that.
Given that most of the popular subreddits were offline for the day, I can't imagine anyone would seriously think they didn't care at all. Failing to address that situation would have been a great way to kill the site entirely.