Dude it’s been this way since the 90’s, at least. It has been turbocharged due to technology is the main difference. Ask me how I know.
American culture is abusive in general, it’s not shocking that abusive behavior has become the norm.
In societies where the law has broken down and failed to make an orderly society, people turn to mob mentality to “punish” those they see as in need of punishment.
In American society law has been broken since at least the Reagan era, and we’re seeing the societal effects in real time. The people doing the bullying are just as under the thumb of America as anyone else, but like classic mob mentality, they’ve simply chosen people they don’t like to abuse as opposed to real criminality. Why? Because most humans are stupid, base motherfuckers, and they always assume that they are a “good” person, and by extension their friends are “good” people so why should they do any introspection, it means that the other people are “bad” people. It’s the same tribal fucking bullshit it has always been and this is exactly why we started trying to build orderly societies with law enforcement and justice you could count on. Now that that’s squarely out of the fucking window, you have a society that is all too ready to dole out mob violence which rarely equates to “justice.” The worst is that the mob is often in the wrong and also in the majority as evidenced by the above anecdote.
When justice fails, when justice is delayed, when justice is deferred, when the cops have special rights to brutalize you but are not held to the same standards and are allowed to break the law, this is what you fucking end up with. A society ready to fucking eat itself alive. It’s not fucking rocket science (although it is social science).