You will see plenty more things Alan - the tail thing I see all the time - I too have tapped<<<<<TAPPED the tail and said tail at the same time in the past to get the dog to stop flagging its tail....
I agree with your concerns - I too feel the same way - the shouting - being too harsh on dogs etc etc.....
Some dogs need the owner to be stern - I know plenty of dogs that are good as gold until they get to a show and then they play up something cronic - but there are limits!!!!