Taarabt, who stormed out of Craven Cottage after being subbed against Fulham a fortnight ago, was the star of the side as QPR won promotion from the Championship last season but doubts remain over his ability to make an impact in the Premier League.
And now Barton has blasted Taarabt's workrate and attitude. Barton told The Sun: "It's not a case of anybody giving him advice, it's whether it's taken on board.
"This is the top level of world football and if you're not prepared to work hard you'll come up massively short. If I was Adel and had his ability, I'd not want to be coming up short, having not worked hard enough.
"I came here and was told he was a genius and I'm yet to see it. I don't know whether it's because he does not work hard enough or whether he tends to sulk."
Taarabt, who scored 19 goals last season and attracted the interest of French club PSG in the summer, is yet to find the back of net this term.