1) People with no manners. 2) Stereotypes. Not people who use them. People who ARE them. 3) People who when they are arguing say "One, that's not even _____. Two, you have not right to _______" And such.
I saw an elderly couple the other day trying to figure out how to use a u-scan and asking for help. The couple was standing on the wrong side of the u-scan. (I'm not making this up). .