I get this quite often too, youth in a generic hot hatch Saxo, Clio etc pulls up along side me at traffic lights revs his engine to get my attention.....usually I will oblige with a rev or two back, lights change he wheel spins and pulls off revving the nuts off his little hatchback I laugh to myself as I proceed to pull off at normal driving speeds for whatever road we're on ....frustrates the life out of them cos I won't race lol