I agree with TB in that I think the distinction is where the outcome is based completely om judgement (gymnastics, diving, etc.) as opposed to scores or a specific outcome.
Boxing and other combat contests are a little strange in that it is possible to just win (KO) but if that doesn’t happen then it falls to judging. But if it is POSSIBLE to get a clear winner absent a judged outcome I say it is a sport.
Judges of clear outcome contests are really referees, checking on rules compliance.
Actually, when you get down to it, the subject of what is or is not a sport, is very tangential to the original subject of biological males competing as women.
So I will just say that I like women’s gymnastics.
Still, I will agree that there is a lot of subjectivity in a lot of “sports”.