There is a subjective element to this, but it is tempered by an objective test: would a reasonable person be disturbed by the noise?
Times, Sunday Times (2014)
Judging these two factors involves a substantial subjective element.
McInnes, Colin NATO's Changing Strategic Agenda (1990)
The fact that there is a subjective element does not disqualify an activity from being a sport, then.
Times, Sunday Times (2006)