They're only shitlords in the sense that they don't mind calling people out on their obesity. They don't mistake it for being healthy or acceptable. There are some pockets of people who think, "I'm totally fine like this, I even look cute!" and then they slowly learn that's not the case at all...especially as they're left out of the dating pool (although this is changing). That aside, Koreans are human and, as other humans, they are prone to superstition...this includes fatlogic. The biggest issue is Koreans have this idea that all Korean food is healthy, no matter what it is. It doesn't even have to be western food to be considered unhealthy; even Chinese food is considered unhealthy and calorie-laden as a default. I have had a discussion where a Korean co-worker told me fried potatoes fried in the Korean style (which includes a batter) are healthier than fried potatoes cooked in the western style (french fries or chips, whatever you call them) simply by virtue of being Korean. Yes, something battered and fried was healthier than something fried simply because the batter and frying were created by Koreans.