The problem OP is that there is an open interpretation of what smacking is. Had you made more choices such as I tap not hit, etc you would have gotten the more defined responses that you later asked for. You gave a yes no option and people have used their own interpretation.
I knew someone that had a child that hit and bit everyone and when he would bite she would bite him so hard it would leave marks.Needless to say he kept biting and she never seemed to make the obvious correlation that she was asking him not to hit and bite but then hitting and biting him when he did so.
Poor little kid must have been so confused