Brauno,
Not sure where you're from, but when I grew up in northern Ohio "ragging on someone" meant giving them a hard time. As I think about it, the term implied not going at it too hard, jsut a step above a gentle tease...so Ch200 pursefights would not usually involve ragging, for example.
As I look around, I am fairly certain you are not within 10 feet of me, so the phrase may be a LITTLE more generalized....