That actually makes me more wary of reddit than tumblr. For others, the llinked-to reddit seems to be mostly about laughing at and sometimes harassing people on tumblr that have pride in alternative lifestyles or viewpoints.
r/tumblrinaction was great in pointing out the ridiculous beliefs and lengths others would go to in the name of "social justice." However, I've seen a surge in activity of making fun of overweight people[1] and even the mods breaking rule one[2]. I'm not surprised by these activities because I expect such group mentality to bring about the same kind of people that social justice warriors did. People make a mockery of "others," it's human nature.