A few years back I took a bunch of the clients I worked with (mental illness) to the local Black History Museum. When we went in I introduced my self to the docent (an African American woman in her sixties) and immediately said, by way of introduction: "I would like to apologize for the way my forebears treated your forebears", she looked at me rather strangely and said, "You don't have to do that", and started the tour. That was the last time I made that White Blunder"