I think his comment re too many tweets makes a tw@t was brilliant! Shows that he has a personality and a sense of humour.Once again, what they thought was a stick was in fact a squeaky rubber chicken and it's left Cameron no more than a little bit tickled. Obviously, the "Twitter twats" synechdoche was a thinly disguised and timely dig at Balls and Milliband, who are, as everybody knows, all-round twats who happen to abuse Twitter.
Boris Johnson says things like this all of the time, and we all love him for it! I really don't this will do David Cameron any harm. Quite the opposite, i think.
For what it's worth, Cameron just got a bit cooler. Which is exactly what he wanted. One-nil Cameron (again).