Sebastian Vettel has admitted he defied his team's instructions at the 2013 Monaco Grand Prix due to boredom.In the dying stages of the race, the Red Bull driver picked up his pace behind winner Nico Rosberg, earning a rebuke for smashing the fastest race lap.Vettel said: "Just satisfaction instead of going slow for 77 laps."Vettel's race engineer Guillaume Rocquelin replied: "No satisfaction for us though." 'I'M NOT TRYING TO DO SOMETHING SILLY'Seeing just how much faster the Red Bull driver was capable of going in Monaco, having conserved Pirelli's fragile tyres, BBC commentator David Coulthard called the current situation in F1 "rubbish".Vettel added: "I'm not trying to do something silly, and I apologise for quarrelling with my engineer on the radio. It's a reflection of how the racing is today, when you can be three seconds a lap faster. "I know that the drivers are not enjoying the races as much as they would like. The show is good up to a point, but if it's a matter of following one another and waiting for the chequered flag, I'm not sure if that is what people want to see."Vettel said he hopes the changes being made by Pirelli for the next race in Canada and beyond will help the situation.