Personally ... i find each funny;
South Park is as funny as relighting a candle, because they would relight it but turning cartman upside down filling him full of chilli beans created by dr. memphesto and punch him til he farts fire. (it was done before and cracked me up)
Monty Python is funny because it was just surreal and abstract from normal humour of it's kind.
Red Dwarf is funny because the characters are a bunch of loosers and probably why it is so popular.
Jasper Carrot is funny ... if you don't believe he is, 'Magic Roundabout Side B'
Alot of programs are funny to me in different ways. Perhaps I have a broader sense of humour than most; As I find Spin City amusing, just as I found Spaced pretty funny.
At the end of the day it is all a matter of taste.
The only reason Monty Python is considered 'definitive' comedy is simply because there has been atleast one moment in it which has appealed to someones humour and made them laugh. They covered so much whilst trying not to be standard slap-stick like Laurel and Hardey or such.
No doubt you never found then funny or Albert and Costello.
Hell you probably don't find William Shatner's attempts at acting funny