Michael Buble Instagrammed this pic...is it OK?

It's exactly the kind of thing I was talking about the other day with Kelly Clarkson and those sports announcers.  People are defending him saying it's not fat shaming (tho some of the hashtags sound pretty judgey).

But let's say for a second it's not fat shaming, or judgey, or any of that.  I still wanna know why people think it's OK to comment on her body.  On anyone's body.

I know I sound like a joyless jerk to some people, but seriously...if it's not your body, why are you commenting on it?