LOL, that's how our Red Tail Boa started out!
First it was pinkies, then small mice, momma mice, etc. and on and on to large rats. With the giant snakes there is a lot of peer pressure to get them as huge as possible. (I know, technically Boas are not GIANT snakes, but try explaining that to my wife. LOL)
Rosyboas peak out at around one meter long, so I don't pick up the same emphasis on physical size in any of the Rosy forums I've visited. Still, she has that look in her eye,"Here we go again." LOL