My story puts me in a unique situation to pull out this one: "I lost over 100lbs last year simply so I wouldn't look like your fat ass." It stings them on so many levels. It's a direct insult to their looks, points out that fat people CAN lose weight so their excuses are debunked, shines the spotlight on their laziness for not losing weight, and there's no retort that isn't 100% nonsensical or hypocritical. I fucking hated being an obeast (admittedly my own fault), but one of the few things I got out of it was the ability to totally shutdown any ham who complains now. I'm immune to their blubberings and that feels pretty awesome as a hardcore shitlord now.