Being a professional flying instructor is about teaching airmanship and to pass on some of that knowledge to your student.
Who is PD a mate of facebook?
Yes i did hold the Class 4 rating and when DCA did my flight test the guy went through the reasoning behind the development of the rating and the gentlemen himself had one of the first one issued at time, so I am sure he would have a little bit more knowledge than you.
In regards to this forum your the only making a dick of yourself!!!