Real Madrid hero Guti has hit back at claims made by Manchester United striker Wayne Rooney during Wednesday night's El Clasico.

The aforementioned Manchester United star was critical of the behaviour of Real Madrid's Pepe, following the Portuguese international's ill-advised stamp on Barcelona counterpart Lionel Messi.

Rooney, who has been no stranger to controversy during his Manchester United and England career, described Pepe as an "idiot".

The Manchester United talisman wrote on his personal twitter page, @WayneRooney: "Pepe. What an idiot. Sometimes people wind u up,"

After Eric Abidal's goal, which helped Barcelona win 2-1 in the Copa del Rey quarter final first leg, Rooney added: "When Messi then set Eric Abidal up for Barca's winner, Rooney added: "Haha. That goal serves pepe right."

Rooney's alleged hypocrisy, having been sent off in the past for similar offences, seemingly irked the former Real Madrid midfielder Guti, who intimated the Manchester United striker's previous indiscretions means he is not best equipped to past judgement.

The former Real Madrid star wrote on his Twitter page: "I laugh at Rooney.

"But there are many saints in heaven, and if you want to be a saint you must lead by example. Making mistakes is human."

The aforementioned Manchester United striker was sent off in the 2006 World Cup quarter finals for stamping on Ricardo Carvalho, and the 26-year-old recently had a three match international ban reduced to two games for kicking out at Montenegro's Miodrag Dzudovic.

The increasingly common use of Twitter by footballers has become more prevalent in the modern game, and according to the Daily Telegraph, Manchester City players have been warned against inciting their Premier League counterparts Manchester United.

The report claims the likes of Micah Richards, Pablo Zabaleta and Sergio Aguero, all of whom use the social networking site, amongst others, have been warned to be responsible following comments made by Manchester United's Wayne Rooney in regards to the recent gesture made by Roberto Mancini.

Rooney was critical of the Italian after he waved an imaginary card in the fourth official's direction during Manchester City's victory over Wigan, an offence that irked Mancini when Rooney did similarly during the recent Manchester derby.

The Telegraph indicate Manchester City have reminded their players of their responsibilities ahead of a potentially intense title run-in, and although Manchester United are a little more liberal with their rulings of the use of Twitter, Sir Alex Ferguson questioned its use last year.

The Manchester United manager told The Daily Telegraph: "I don't understand it to be honest with you. I don't know why anybody can be bothered with that kind of stuff.

"How do you find the time to do that [tweet]? There are a million things you can do in your life without that.

"Get yourself down to the library and read a book. Seriously. It is a waste of time.

"We as a club are looking at it because there can be issues attached to it. And we don't want that."