Catty people who claim people are a waste of oxygen/space/whatever when the catty person will likely never achieve the level of success the person they are bitching about has.
Case in point. Someone posts a picture of Mischa Barton's legs looking flabby, and some colostomy afterbirth, going by disco_balla, posts:
Most useless waste of flesh and bones ever?
When disco_balla accomplishes more than getting the "frequent customer discount" at the planned parenthood clinic, they might have room to talk.