Mockery
Mockery of stupid people, things and ideas (such as Deities, Gay GOP scandals, Bush II, Trolls) is a common pastime on SDN.
Stupid People
Many debators on both sides of the 'versus' debate are stupid people. The followers of Darkstar being a prime example of the extreme end of the spectrum.
Another example of a stupid person on SDN who is still (relatively) sane is chitterling AKA Chithoryu12
Stupid Things
Fundies AKA Fundamentalism, See Lots of Stupidity.
The comicbook industry is supported by slavish, quality-insensitive fans, and is thus ripe for mockery. For an SDN example, the Civil War banners.
Stupid Ideas
Ideas may be stupid for many reasons. Holding a stupid idea opens one to mockery, and the idea itself is also able to be mocked. A 'versus' example of this would be the Alderaan Argument, which is so obviously incorrect it is only held by the truly stupid.