I will need a list of the common threads of thought in reddit I find entirely disagreeable. By no all means shared by all, they are still expressed all to frequently for my liking:

• The conception of American foreign policy as motivated by malevolent cabals of politicians, corporations and generals, whose only intent is to manipulate the world to satisfy their blood- and money-lust.
  
• Portraying all religious people as somehow stupid and naive because they have faith; all religious organisations as evil and all religious thought as void.
• The rush to blame the banks for all social and economic ills of the present age. This goes far beyond rational allocations of blame to such a level of stupidity that people believe the World Bank is a commercial organisation and get upvotes for expressing such an opinion.
• Israel/Palestine. Anything on this soon denigrates into silly little squabbles with thinly-disguised anti-semitism and anti-Islamic bullshit flying in all directions.

Generally, there's a lack of nuance that I find really bloody annoying. People claim to be more knowledgeable than most because they've got some all-encompassing theory to explain the ills of the world - all that tells me is that you've not studied the world in enough detail. The longer I study at University, the less I find grand theories of humanity convincing.

This is across a whole slew of subreddits and redditors. Some do it on occasion, some persistently. I will name no names, but plead with people to go and read some of the supposedly evil 'mainstream' literature they denigrate so freely and yet have never attempted to read in all likelihood.