Political correctness and language codes are not new. I think what was new is the idea that people could rally around the banner of awareness, and thereby avoid disputes about solutions. This is why many of these topics lose momentum once their followers get the attention and have to deal with the hard and less popular questions of how to fix something.
I thought that this was particularly evident in the defund the police movements, where poor minority neighborhoods actually wanted more policing and law enforcement when polled.