I was listening to a call in radio show on my way home from the doctor and they were talking about the fight that erupted between 2 women because the one lady was eating spaghetti on the subway train. They were going back / forth verbally and then it broke out into a fist fight. It's on Youtube now.

So the radio show was asking callers to tell them, what they would not like to see people do publicly. It could be something funny you saw or something that irks you. For example here in Canada people can't smoke in bars or restaurants. I'm hoping to avoid debates. I'll start by saying it bothers me when someone picks their nose in a public place.