Noise!
Living in a city, I am exposed to many sounds that, over the years, I have gotten used to and accepted. Pleasant sounds, particularly of birds, squirrels and other nonhumans are music to my ears. Unpleasant sounds like cars, machines and loud people are a part of our society and can be gotten used to. It's the noxious sounds of incessantly barking dogs or motor bikes screaming down the street late at night that are totally unacceptable. That leads me to be quite judgmental of those who allow/create it. Plus, it makes my face red and my hair stand on end. I'm not sure I could ever integrate and accept those sounds into my life.