The default assumption in the US is that if you’re living with parents, it’s because of a life situation (divorce) or because you can’t afford to live on your own. That’s why it’s seen as a culturally bad thing. If someone culturally chooses to live with their parents, it’s probably an immigrant family, it’s just not common here. Living with your family here usually is code for “not thriving”. Not saying it should be like this, but that’s how it is. I’ve never heard someone actually get out down for living with their parents, if anything, people respond positively and say “I wish I could do that” “you’re probably saving so much money” etc.