Richard Cheney has more to do with it than some people want to admit. He directed the FCC to eliminate provisions that required media companies to give air time to multiple points of view. In other words the style of media that most Americans watch today would have been unlawful twenty years ago because it wasn't balanced and didn't present both sides.
Additionally, without the 90's attitude to specifically, "Do your own thing" that has since gone out of vogue has reduced social pressure to behave like an adult and to generally ignore neighbors that you didn't like. Virtual signaling, anathema in previous eras is now tolerated or actively promoted.