Not sure if youre male or female. If youre female, organise a girls night in and invite a fat girl. Youll experience it yourself. She will turn it back on you and accuse you of ruining the night being angry about an insignificant pizza instead of it rightly being about being a greedy little porker and her ruining it for everyone else. Thats gaslighting. Thats a sociopath. If youre a dude, poker night will do the trick, but dudes less likely to confront directly rather than let it happen and hang shit while fatty lashes out online and whines his mates wont invite him out. I grew up with the chick by the way. She practiced all that shit at home. tl;dr fat chicks are the whiniest people on the planet because they are literally sociopaths.