It has to do with censoring people who dislike obese people, and the hypocrisy of it when they allow other "hate" subs and "offensive" material.  The problems seems to have kicked off last month when Pao banned several Subreddits (forums), which users believe personally offended her, the largest of which was ‘Fat People Hate’. This was done under the manifesto of cracking down on harassment. It did not go down well. While this particular forum was combative, it wasn’t targeting or harassing individuals. In fact, there were strict rules against it. This was seen by many on the site as the first wave of content cleansing, censoring the parts of Reddit that Pao personally found distasteful. As of writing there are currently forums about having intercourse with dogs or the graphic sexualisation of My Little Ponies