A childhood belief about speaking

okay, this is gonna sound very wrong, but I swear I believed this at like 3 or 4, tho I have no idea where I got it from.
I had the word nun confused with a certain word that is used as a derogatory racial comment, n****r. (I wont even say it now, let alone type it.) One day while my mom was on the porch sewing and talking with some of her friends, I picked up a spare piece of cloth, that was black, and put it on my head, like a nun, and exclaimed, "Look, mommy, now I am a n****r!"
My mother was horrified, and had no idea I meant nun. (One of her friends who was sitting there was black.) She told me that it was very bad and I was to never say that word again. I couldnt understand why someone I had seen at church was a bad word to say. This didnt get cleared up until I was about six and started religous education classes at school.....