That is some really good advice.I don't leave feedback for them at all. Like my mother always said, "If you can't say anything nice, don't say anything at all." You can't leave them a positive if they've messed you around. If they've already left you a positive then you'd feel mean giving them a negative or a neutral; and if they haven't left any for you and you leave a neutral or a neg then you risk retaliatory FB. So ... I don't say anything.
I would say that your mother is a very wise, like most mothers are.
Now I wish I would have listened to more of what she said!