I have actually decided I was wrong here.  Shaming works for humans but not hams and I am not sure it will ever work on them.  Humans in the last resort will go to shame in their internal decision tree and not die their hair blue or put the biggest cow ring though their nose when they are already 300 pounds.  Those that feel shame know what happens.  These creatures just don't care and in fact love the negative attention much like a toddler.