Both Tara Tainton and Ms Dee (Ms Dynamite) have done these.
Tara Tainton does one where she offers to take her circumcised nephew to 'the same plastic surgeon who did my boob job... he can sew on some pig skin or something to replace your foreskin.'
And Ms Dee kind of teases circumcised guys about it being such a shame they lost 20,000 nerve endings.
There's also one floating around with an English chick putting down 'foreigners with mutilated dicks' or something like that.