I think having the audacity to call “extremely rude” something as benign as barely questioning an anonymous account’s credentials is the definition of melting down.
It’s hardly rude, let alone “extremely” rude. People who are transgender are straight up told to kill themselves daily on social media by bigots and you’re melting down over someone having the temerity to question some random account’s (ie, you) credentials? Grow some thicker skin.
You claim shame was tried and was unsuccessful thus we should drug people. But what about the opposite of shame? Education, encouragement, non-judgementalism, and providing all other support required.
So clearly it’s something to do with the difference in their lives in the USA, but your first response is to treat the symptom with drugs rather than look at their life holistically?
Just off the top of my head the food (portions, quality, etc) in the USA combined with how much people no longer can walk vs being required to drive are a huge contributor to weight gain of immigrants to the USA.