Why do these people celebrate being leeches to society and seemingly aren’t self-aware?
Because a person's goal in a capitalist system is to do nothing while getting everything. To ascend from the exploited to the exploiter. It's wrapped in rosy language such as "passive income", but that's what it is. If a person can be a neet outside their parents' basement (which seems to be the case in what you describe), one must ask where's the money coming from