I'm not totally convinced that attending parties is a good way to measure someone's health, but it might be true that people who always stay at home and don't socialize could have more mental health issues. Since we are social creatures, interacting and talking with others is important for our mental well-being. If someone prefers to stay at home and avoid others, it could lead to problems later. So, it's possible that these people might be less mentally healthy.
I'm not totally convinced that attending parties is a good way to measure someone's health, but it might be true that people who always stay at home and don't socialize could have more mental health issues. Since we are social creatures, interacting and talking with others is important for our mental well-being. If someone prefers to stay at home and avoid others, it could lead to problems later. So, it's possible that these people might be less mentally healthy.