This one might cause the demise of my marriage. My wife often uses the microwave to heat things up. She programs in a minute and takes her stuff out after 30 seconds. but never presses the clear button so the digital readout always says food instead of the time. Now that I'm calling her out, she rinses her plate after dinner and such but never puts it in the dishwasher. It's literally 2 feet from the sink.
people who smoke in non-designated smoking areas, especially on public transit every time I'm in Chicago and use the CTA, there will always be 1 or 2 people smoking in the train car or blasting sh*tty music with no headphones
This leads me to another annoyance. People that leave their car running at the gas pump while blasting their radio.