Racist "joke"

On Saturday night I was watching four lads on Regent St. The guys were in their late twenties. They wanted to get a minicab and go somewhere. I guessed it was a rather distant place for they didn't seem happy at all with prices named by those Asian drivers waiting by Heddon St. They kept passing from one to another. I couldn't hear what was said but suddenly one of them stepped back from a driver he was talking with and shouted: "What?!!! £35??!!! Your father was driving an elephant, bruv!!!" Off they went...