I would say I did exactly what ryn did. And my kids don't bite. It has to be consistent though, its something you need to do every time, and both parents need to be onside as well. Please don't jump on me, but I wouldn't bite back, it gives very mixed messages in that the child will think that if someone does something you don't like to them then you have permission to do it back and thats not the case for most things.