moral envy:

feeling of envy and resentment directed at another person, not because the person is wealthy, or gifted or lucky but because his or her behaviour is seen as upholding a higher moral standard than the envier’s own

That's exactly what I thought when I read this. We have multiple antivegan accounts on my instance that spout this crap and troll others. If they get banned, they come crying back instead of realizing how unwelcome they are. What a waste of time to spend it this way instead of actually helping people. You can't talk about veganism on here without the same type of asshole coming out of the woodworks.