That's been part of the democrat agenda if you all the way back to when the party was first formed. It wasn't quite like that as much in the 70s, 80s, 90s, and 2000s. But their obsession for hating groups of people began again probably around the time the tea party was formed. And there's been their never ending obsession with Fox News since about 2012.
Hate seems to be a regular part of their agenda now. Since 2016 it has been Trump, Trump supporters, unvaccinated people, people who protested the mask wearing, doctors and scientists who don't go along with their agenda, and now Russian people. And let's not forget their constant obsession with wishing people be censored. Did I miss anything?