Ift's fine if they like music better but their need can easily be satisfied by wearing earphones. It's harder for people who don't want music to remove it.
if you listened to your arguments for the "other" people, you might consider getting ear plugs or noise-canceling headphones yourself.
Music at the gym should be opt-in, not opt-out.
There's still always going to be some "opt-out" sounds at the gym. I'd prefer it be any kind of music rather than "Hnnnggg, urrgghh" and clink-clanks.