I probably shouldn't resurrect this thread. For one thing, it's kind of a bummer. And I won't go into all the various ways people have hurt my feelings since I started breaking out as a freaking CHILD. Ahem. But I have really good, kinda funny one. It's a twist on the age-old, CHOCLATE=ACNE cliche.
I was probably about 12, 13 at the time, and after breaking out for years, I was starting to get cystic acne. I had a big one on my forehead that finally ruptured and left behind this huge, completely flat, crusty, and weirdly brown scab. So, this girl I knew, who I totally love and probably didn't mean anything by it (or maybe she did, we were teen girls and teen girls are terrible people, let's be honest) asks me one day, "Are you sure that's not chocolate?"
Yes. YES, you idiot. I have had some kind of enormous thumb-print of chocolate on my head for what, a week? and simply haven't noticed because apparently I never sweat or wash my face or anything. Sigh. She asked in this happy tone, too, like I was going to reach up, rub off the chocolate, and laugh in relief at what a silly doofus I'd been.
Realistically, though, I think a lot of these comments stem from a fear that they, too, will one day have to deal with acne. Like, "Oh, I won't EVER get acne because I wash my face." Someone said that to me once. Or, "I'll never look like him/her because I don't drink soda." People do it with other things, too. "My husband would never cheat on me like hers did, because I work out and do (x)." Nobody likes to feel vulnerable, and looking down on others is a combatant, that's all.