It's an act of protest against what they perceive as "the liberal nanny state". Every mask deliberately unworn is a raised middle finger, a statement of "I refuse to do anything you ask me to do".

It really is childish and contrarian, but that is what politics have become, a black/white view of all issues, with a sports team-level fanaticism to always follow "my team", while demonizing "your team".

And one party in particular has been fanning the flames like crazy.