When you’re in the water that much, I think you just end up getting desensitized to it.
I’ve seen things you people wouldn’t believe. Teammates going to a corner and openly declaring “don’t come over here I’m peeing.” Coaches literally encouraging it, saying it’s not worth it to get out and miss a set when you can stay in the water: “your urine is just a tiny, minuscule fraction of the total volume anyways”
When you spend that much time in the water with your teammates, it’s no longer an “open secret” that eveyone is doing it. It’s simply open.