well, when my family went on a cruise (this was connected with Disney World) the entertainment was a guy who was impersonating Al Jolson, complete with the shoe polish and everything
i couldnt believe it
he spent awhile first explaining to us why this was not racist and then sang "Mammy"
it was unbelievable
what may have been accepted in the late 19th century sure isnt acceptable now
at best it was way out of date, at worst it was offensive to a lot of people