I must admit I have some sympathy with Cameron on this.
He does not act like feminist so he avoided the trap being set for him, and he declined to wear the t-shirt.
It is stuff Like this which makes the Labour Party look a mess. There are plenty of things for Labour to have a go at the Conservatives for, but failure to wear a t-shirt should not be taking up their time. They are unfocused, not addressing the real concerns of their core voters and are badly led.
They will probably win the General Election by default, but the sparcity of talent there does not bode well.