Likely not to their face, but I’ve absolutely had tons of people use it when talking to me as a slur for other people. Because they assumed I was like minded.

It’s absolutely used as a slur in conversation, yes.

I mean you have the Republican President of the United States publicly calling Democrats evil. People like to pretend their party (Democrats and Republicans alike) generally adheres to decency and decorum even though they demonstrably do not, but it’s especially rich for Republicans to act like they’re the party of decency in politics when they’re falling in lockstep with Donald Trump