Some people pace back and forth when talking on their cell phone. It makes me grumpy when they do it in front of a checkout aisle at the store. It's like they're standing guard to prevent others from entering the Queen's Courtyard. Heaven forbid you interrupt them.
Don't confront them, they'll go nuts. Give them the space they need to be discourteous.
According to the internet everything is bad for you, no matter what you eat, drink or breath. Nevermind that at this point, us old farts can fully expect to live until age ninety or longer. For the first time since 1900, younger generations have a life expectancy that is actually declining.
Don't argue with them. Take them to a nursing home to see if they want to live that long.
Democrats and Republicans have disagreed for decades and they always will. Hell, they often didn't even want to be buried in the same cemetary. Only since the internet was invented did it get so bad that the country became this divided. Fox News, CNN, MSNBC. Blah, blah, blah. Let's log on anonymously and call each other names.
Don't argue with them. Give them the space they need to hate each other because historically, they always will.