(fingers in ears) la-la-la-la

I spent three hours yesterday at a doctor's office with the youngest. Much of that time was spent in the large playroom where children play with almost any toy imaginable. A sign on the door announces it to be a Safe Zone, that no medical procedures are to be done inside the playroom.

A couple nearby took it one step further and decided that since it was a Safe Zone, they would go ahead and have a discussion about each other's transgressions in voices loud enough to be not just audible, but unavoidable.

air one's dirty laundry
Also air one's dirty linen or wash one's dirty linen in public
idiom
Expose private matters to public view, especially unsavory secrets. These metaphors are reworkings of a French proverb, Il faut laver son linge sale en famille (“One should wash one's dirty linen at home”), which was quoted by Napoleon on his return from Elba (1815). It was first recorded in English in 1867.
"wash one's dirty linen in public." The American Heritage® Dictionary of Idioms. Houghton Mifflin Company, 1992. Answers.com 20 Dec. 2005. http://www.answers.com/topic/wash-one-s-dirty-linen-in-public