I read the short version of the piece in the OP and I agree that things, as described in the piece are not getting worse. In fact, at least where I live, when it comes to common courtesy, honesty and things like that, things have gotten better over the past 25 years. My city is almost 50/50 black to white. When I moved here, the first black family to move into my neighborhood was greeted with nasty racist shit written on the front of the house, which I think was a rental at the time.
In 2003, my first black home owner neighbor moved two doors down from me, a lovely woman who is also an RN. As the years passed, almost every area of town has become more racially integrated, so I now have many black neighbors, most are professionals, retired or skilled workers. People all seem to get along well, despite our political differences. Many of my neighbors aren't religious, are "Nones", cultural Christians or church goers who never preach to anyone. Our local atheist group was started by a former neighbor of mine. He and his very religious mom were very close, and loving, despite their different beliefs.
Our senior center is a wonderful place where friendships develop and people of different educational backgrounds, racial backgrounds, etc. respect each other. I've made a few friends there, including a couple who I consider close friends. One evangelical tried to convert me because she thinks that non believers are going to hell, which made me a bit angry, but I know she meant well. She's just been brainwashed into believing nonsense. Still, I told her I thought she's a good person and that's all that matters to me. Hopefully people like her will meet more people who are non believers and come to terms with the fact that most of us are decent people, and it's silly to believe in a god who punishes people for not believing that he's their savior.
I don't hear gun shots, although I'm sure that a high percentage of residents own guns. It's illegal to shoot inside our city limits.
On the negative side, a large group of young gang members were recently arrested, after an investigation that lasted several years. I'm sure that the good people in that area are pleased not to have to worry about that as much now. But, gangs have been around for pretty much ever, even if they were very different from today's gangs. It's a way for criminals to take advantage of young boys who lack good family support, who live in poverty etc. It gives these boys a feeling of belonging. That's nothing new. It's sad. Maybe we, as a society need to work harder to see that all children have adequate housing, food, parental support etc.
I would agree that things are worse for gay and trans folks, depending on where they live. But, during my childhood, people who identified as gay or trans were deep in the closet. So, while things have taken a turn for the worse for those individuals, hopefully, that will change as younger generations realize there is nothing wrong with being yourself, even if you are a bit different from the majority. I have gay friends here who seem happy too, but then they are part of our little atheist group, so why wouldn't they be happy.
I've lived in the South for most of my adult life and I've seen a lot of progress when it comes to race relations. I've even had a fewl Trump supporters as casual friends. We are kind to each other and simply avoid discussing politics or religion. They know I don't share their view points but we try and look for the better aspects of character instead of concentrating on our differences. At least a few of my neighbors had Trump signs out in 2020, while a few of us had Biden signs out. No problem. We all respected each others right to free speech. Unfortunately, the media loves to concentrate on the negatives most of the time, and there is too much propaganda aimed at people who are easily manipulated. I grew up in the "love it or leave it" 60s. When we protested the Viet Nam War, there were angry conservatives screaming at us. How is that any better than what goes on today?
So, while it's not perfect, I can't say that it's any worse than any other time in my life. I find most people here are friendly and much to my delight, I've been treated respectfully as I've become older, even by most young. people. Maybe I just found the right place for me to live. That may be my anecdotal experience, but I've lived in 7 different states in the US and I don't remember it being better in the past than it is today, when it comes to how most people treat each other, which was the point being made in the piece in the OP.