IDK about that. My bezel is smooth, no rattles, or loose parts. I thought about all my other watches with rotating bezels and they don't make any noises either, some are inexpensive Timex 25 yrs. old. . I would definitely seek a replacement or fix.
I've read that loads of Gear S2's had the same thing but I can't see much info on the S3 either way. It's not that it's really loose, and it works perfectly, it's just the slight noise you get when you tap on it.