People are different and have different responses to audio. It bugs the OP, it may bug some people, it's unlikely to be a general thing or we would have read more about it before now. You don't know how much it may irritate the OP, but if he is muting the game because of it, it's probably quite a lot. Not very helpful to ask him to ignore it. I, for example, hate the sound of ice being scratched. Some people hate the sound of chalk on a board.
That's why a mod would seem the best course of action, if people know how to/are able to alter the UI sound.
