In the US especially (though it seems to me international English-speaking spaces, probably driven by US dominance?) there has been a steady erosion of 'formality' and 'formal' etiquette, and a shift toward informal-everything. And as a neurodivergent person with 'social deficits' this has long driven me crazy
There seems to be an idea that formal etiquette=the etiquette of the rich/elite/ruling class. And it's true that the most commonly recognized formal etiquette is just that