It is a great time saver, the confederate flag serves a similar purpose.
It says, "I can't wait to be disagreeable to you if you aren't on my team."
Occasionally I end up in the homes of one of these people, I keep to myself, keep everything professional and nothing more, yet they'll prod at you to try to figure out what you think, aka "Are you on my team or are you the enemy?" It's so exhausting. I just play dumb until I can get away.
Claiming to be neutral upsets them, too. It has to be “OH YEAH I love that degenerate and deranged career criminal, he’s the best!!” or they are skeptical and upset.