"crazy" is a little unfair there. Particularly with just how mainstream it has become to collect and use retro hardware.
I think what you're trying to say is "the aforementioned social network doesn't have people who share the same interests as me" rather than it being full of people who are mentally unwell.
So your definition of 'normal people' is people who have no hobby and are in no way interesting? Are artists 'crazy' too? There's plenty of those on Mastodon. If your answer is yes, am not sure I want to follow the 'normal people'.
As another poster put it "An alternative to the mainstream doesn't appeal to people who don't reject the mainstream".
I think what you're trying to say is "the aforementioned social network doesn't have people who share the same interests as me" rather than it being full of people who are mentally unwell.