Do teenagers have unhealthy relationships with social media? Of course. They're teenagers. A lot of their relationships ARE unhealthy at that age anyway, and if disconnecting completely is the best way to rectify those issues, more power to them.
What gets me is grown adults on HN talking about "abhoring social media" and "no phone Sundays with my girlfriend" and "having a minimal social media presence because I hate what it's become" and "I believe social media time should be controlled" and "social media is a class A drug". Like, chill. Go follow a few meme pages and hide the posts of the people you genuinely detest. There are ways to avoid those unhealthy cycles without entirely disconnecting oneself from literally all one's peers and losing the immense utility that social media provides.