If you submit a review for a paper and all it says is, "We already know this" (or something similar) but don't provide citations you should be banned from reviewing papers.

If we already knew this, do you think I'd've written it ya twit? Why don't you check my lit review where it shows the existing research _doesn't_ already know this.

Nonsense.

(Reviewer 2 recommended R&R with minor revisions....)

@JWright This is when you write an extremely polite and eloquent letter to the editor to request a different reviewer, with a reason that can be simplified to "this guy is an unhelpful douchecanoe."

@invaderxan

In hindsight I really wish I would've just gone straight for the douchecanoe