You absolutely can opt out. Just don’t take it. Unless your store is grabbing you and standing there watching to make sure you do it or something. We are to just mention the survey to people and hope for as much participation as possible.
Personally I don’t know why people don’t do the survey. It’s a chance to voice your opinion on matters. Maybe you’ll see change maybe you won’t. Yes sometimes they have been able to narrow down the groups unhappy. But if you are unhappy about something why wouldn’t you want to voice it and hope to see change. However you can’t just use it as a “bitch-fest”. If you have legitimate complaints be prepared to back them up as to why. Don’t like your leader, why? Can’t be just cause they make you work.