Funny, in the early 2000's I had a similar experience in Zagreb. I was walking in the historic quarters of the town when I heard a young man shout Nigger. Strange coincidence, he also had a bicycle. I turned around to look at him. I was in a state of shock. I had a puzzled expression on my face. I stared at him without saying a word. He looked back at me with a bemused expression. He then shouts Nigger again but this time added MTV, gave me the thumbs up and cycled off.