12 FU's Of Newgrounds Excuses does not grant leeway.
Criticising in the name of comedy? Never. This is comparable to criticising someone and telling them it's a joke. It's not even funny. Everything has flaws, and almost everyone who goes on the site knows what's wrong with it.
Criticism on Newgrounds famous on Newgrounds? Never. That's like a video on YouTube saying YouTube sucks, or on a Christian site saying Christianity sucks. Just not gonna get it. Numa numa on the other hand, is entertainment.
Doing cliche stuff is not funny at all. Neither is pointing the middle finger at the viewer half the time.
Depicting from the submission description, your ignorance and pride overwhelms your tolerance to criticism. You may object, but pointing it out was as easy as the video points the flaws of a flash hosting site. Congratulations on achieving nothing.