The human need to move as a collective made dub note nights fun, because it feels as if we're watching it all together.
Kinda like that episode of Seinfeld, where Jerry said:
"What's the point of watching a bad movie if you have no one to make sarcastic remarks to?"
While Dub Note is hardly a "bad" show, the point is all the same. Despite our possible hikikomori and social withdrawal tendencies, we anons need each other because that makes discussions a lot more fun.