I've seen it happen. It should probably be in talesoffathate or some shit, but yes, I know a kid, actually a guy I graduated with and a younger kid that hangs out with some former friends, who would do such a thing on occasion. So, actually two people. It both disgusts and saddens me. I also no longer hang out with the one in particular that I graduated with, as his eating habits just absolutely disgust me, and I hate being around him when he eats, the noise and sight are just sickening. Fat people are disgusting. OP's mom, however, seems great.