This "report every post" behavior has happened before, more than once, though when it did it wasn't just one person being the lightning rod. The likely person who did it in the past is no longer active.
I have my suspicions who the culprit was this go around, though I refuse to divulge.
Things have quieted down, and that is a good thing. We don't need the pettiness displayed by the juvenile behavior.
As I said when this happened this go-around it won't affect me being here. It just means I won't get any more laughter at their expense as they rage futilely into the night.
It would be more serious, though, if admin took action re the reported posts and suspended the accounts of those being reported. A while ago I had similar with nearly all my posts over a couple of days reported. Currently it seems that the only action taken re a reported post is for the post to be marked as 'reported'...