As some one who finds the joke funny, allow me to answer BigG
The abuse of women is not funny, nor is binners sugesting it is (honest). What he is doing, effectively, is calling STW forumites a bunch of letches (you know, the type that giggle when they hear the word ‘boobies’) using a news event, linked to said forumers (the bike bit) as a starting point.
Jokes go off a bit when you have to explain them, twice, don’t they?