Azizi - I'm more inclined to acting colorless, as you suggest but I didn't wrote the song. I am certain that the singer of the song is purposely denoting the color of young man who stole his girlfriend from him in the same way I might say, "She ran off with a football player" or "She married a Tory MP" or "They drove off in their Range Rover." All comments meant to have rich connotation, but the singer is not focused on the young man. The singer is focused on the girl who broke his heart.

"When he took her off Birmingham
She took away my soul"