At least to me, it seems people push back on sociology claims that focus on individuals or member groups, not so much on organizations like companies. Part of this I believe is due to the personal nature. Part is because it can be seen as stereotyping, or has poor study design.

This particular example is playing both sides in a generic way. Half the people say "oh yeah, Fox spreads BS", while the other half is saying the same about NBC. If they called out one or the other, it just turns into a shitfight.