The correct action, if anything, would be to address the PL problem and put a stop to it so that at some point in the (near?) future lower-level party grinding will be a possibility. It's absolutely unacceptable that players be made to resort to not playing the game just to progress.
My wife recently volunteered complaints after being Powerleveled: "This is boring; I want to play the game but this is all anyone's doing".
UNACCEPTABLE.