fellow ex-fattie here. When I was carrying that extra 50 pounds around (eww) I was constantly self conscious (rightfully so) and so anything that someone said to me felt intensely personal, like I was constantly being critiqued. So I blew up in people's faces a lot. My little brother even said to me, "it's so nice that you're not fat anymore, because now we can tease you with you crying/ punching us." So true.