Dave Cohen's piece has some fair points but linking Carr, Boyle & Sadowitz in with the Mannings of the world seems somewhat bizarre and far fetched.
Manning was a tin of ronseal whereas the others (to different degrees) outwardly say that they are a tin of ronseal but the joke works because the audience knows that they are not a tin of ronseal but whatever the metaphorical equivilent is when tin of ronseal = obnoxious racist/misogynistic/homophobic bore.
It's a wheeze that plays on the fact that stand ups are a liberal right on pinko guardian reading bunch who take offence at most that life has to throw at them. And get this: it turns that on it's head! But that joke's wearing thin and Frankie Boyle plays it as close to the knuckle as he can. As Kurt Vonnegut warned us in Mother Night, we should be careful who we pretend to be because we might well become that person.
Anyway Boyle is a tiring Bully who I still find very funny from time to time but Tramadol Nights is appaulling ill conceived and rubbish.
Oh - and Sadowitz can do what he likes as far as I'm concerned, I'd trust him 100% with any material. Boyle stole his whole shtick from him but doesn't do it half as well.