why is that man's ability to speak well in front of an audience is the measure of his education and training? examples

I think this statement is untrue.  First, the term 'man' ' I  reference to the human population is so old fashioned that I wonder about your own education.  Assuming that everyone will agree with your statement is unwise.  I disagree with it.  I could give examples, but that's not what you're looking for