SINGAPORE - Sebastian Vettel crushed his rivals and tightened his grip on a fourth consecutive World Championship to yet another sea of boos at the 2013 Singapore GP.After facing the jeering disapproval of Formula 1 fans in Britain, Belgium and Monza and Malaysia (home to infamous “multi-21” affair), spectators under the Singapore floodlights also booed the F1 ace on the podium.Former grand prix driver Martin Brundle said on the podium: "Please don't do that, that's not correct." Vettel joked: "They (the booing fans) are on a tour. They go round on a bus."SHOULD VETTEL STOP WINNING?Jokes aside, the booing raises some interesting questions. Are fans tired of seeing Vettel win so easily? Do they simply want the 26-year-old's four-year run of title success to stop?Do they just not like him?Vettel said: "Some people like what we do, others do not. If some of them boo, I take is as a compliment, they're jealous, because we are winning in front of whoever they are supporting. I think it's not worth thinking about -- in the end we love winning."Mercedes chairman Niki Lauda commented: "(It’s) Ridiculous! I can only take my hat off to him, for me he's outstanding. "These people don't understand what this sport is about - you have to have respect for what he's doing. If I could choose, I would give him the championship today."