It doesn’t even matter what the thing actually is, or if it is deserving of disparagement. All that matters is the authority have declared it so.
This is basic authoritarianism/fascism. Trump and Fox News and 20 years of Republican tribalism have groomed their audience so that their audience is ready to almost immediately accept their enemy-of-the-hour as soon as it is declared. And any thing that enemy does is suspect or bad or evil.
When I was watching the “Lock Her Up” chants from the 2016 RNC convention, all I could think of was the Two-Minutes’ Hate from 1984.