There's been a gradual slackening with regard to how importantly manners, self-discipline, and pride are valued.  Some of that comes from entertainment setting such a low bar that, at best, one can feel like a winner in comparison without having actually done anything meaningful or, at worst, have a terrible example to follow.  And marketing offering flattery or acceptance where none is really warranted for the sake of pushing a product.  And the gradual mental retreat of first world humanity from trying to fit into the community around them into online spaces that support and reinforce each others' niche opinions and habits (the irony of posting this last sentiment here is not lost on me.) The constant pursuit of and catering to instant gratification was the tipping point, I think, that built the communities you mention.