"...seems to be leading to a fractured partisan nation where everyone hates anyone who even slightly disagrees with them."
This, 100x times over. The cultural toll of 'conformity' sounds bad until you realize it's a construct enabling everyone to 'play nice' in the general sense and work towards a greater good, collectively. We are losing that conformity. The average US citizen person is socially crippled by their outrage. Nothing else matters. If you have doubt in yourself, get back in that echo chamber that probably made you into what you are and reassure yourself. It used to be ok to disagree, have intelligent debate, vote on it, and lose.
In today's US, if you want to be heard, it's more about how emotionally outraged you are, not how good your ideas actually are. The more dire you can make the outrage, the better. Come up with a sound bite for your movement, catchier the better. Misrepresent anything your oppositions says, retire objective and reasonable critical thinking to 'dinosaur thinking'. Then, convince people your group/movement/lifestyle has been marginalized. Then, if your subject agrees with you, make sure they're at least as outraged as you. Use any guilt that they have to steer them current or future causes. Next, if they won't comply, publicly shame and label opposition so that you can associate them with bad things/people/events. When you dont get what you want, attack the process, call them bigots, etc. Rinse and repeat until you get what you want.
As our "cultural tolls" are avoided or erode, the more divided we become as a people. The more divided we are, the more we are seen as individuals. Everyone becomes marginalized when everyone is an individual. The more divided we are, the less we hold open doors and the more we slam that door in their face, because you know... they're a bigot or whatever, so you dont have to feel guilty for hurting that evil person.