Feedback on feedback

At the homebrewer's meeting, a fellow homebrewer offers feedback on Max' and Paul's beer.

Home brewer: Hey, did you guys want feedback on your beer?

Max: Sure!

Home brewer: It's totally nasty! Did you throw a dead rat in the fermenter?

Worst beer ever! My dog can brew better than that! Makes me wanna throw up!

You made every mistake in the book and this isn't beer, this is some vile malt soup with a hint of hops and lots of off-flavors.

It's totally ---

Max punches the complaining homebrewer and knocks him out.

Paul: What was that?

Max: Gave him some feedback on his feedback.