How's it hurting me?  It makes it impossible to buy clothes online because I have no idea how much they're fudging the sizes.  Is this actually a Medium or is it a fat Medium?  Do I need to buy a Small for it to actually fit me?  Why can't I find 28-waist 32-leg jeans?  Fat people want sizing to reflect "reality" so they can find clothes to wear that don't make them feel like land whales for buying a 6x T-shirt to stretch out.  So some businesses vanity size their clothes so people who are overweight can feel less like the bulge-quakers they are.  Which means the rest of us normal people get shafted when sizes that used to fit us actually start to swallow us and we can't even find normal sized clothing anymore.