Unfortunately there is no way to get rid of it. I was in fear my kids would login to my XBOX and hit the button so I put a password on my account to be able to login to XBL. Pretty happy they have this feature in place.
Yeah, once you get to Master Prestige, the only option you will see is Fresh Start. But unfortunately, like the other user said, you cannot do anything about it.
At least with Fresh Start you have to select Yes, about 4 times before it takes effect, so if someone were to accidentally click it, it wouldn't reset you. Now if they accidentally click it 4 time, then they're just straight up being *****.
NEVER argue with an Idiot. They will drag you down to their level and beat you with experience.