Tough - I think

would I

RE Original post  - it's just tough. But would I ask them politely to think about not spoiling my race? I probably wouldn't if same class but might if theyre in a faster boat - especially something with a big wind shadow like say a 5K. 
Several poor rule interpretations here - some corrected but some not - for instance - isnt Proper Course the course you would sail in absence of other boats? So potentially, it isnt even 'legal' to consider the turning boat as suggested. 
I've sailed against GRF loads of times - he is a bit loud sometimes, but not in an intimidating manner. His rule knowledge and observance is way above average. 
Some here are so easy to wind up. They become parsimonious when GRF does his 'thing' and as usual, exaggerates for effect. Even when he retracts  saying it was a joke - levity even, and says the 'hail' could be conversational you still keep coming back.  
Report him for calling someone a stuffed shirt? Talk about defining the phrase!  When Sargesail describes a hail that strictly isn't 'allowed' hardly a murmur was said about it - and certainly no condemnation. If you're gonna be stuffy at least be consistently stuffy. 
Most good sailors do what he describes to some degree or another. Its common sense to hail to warn of your presence, to appeal for fair sailing / consideration, even perhaps to help the non ROW boat to keep clear. 
I agree deliberately false hails are totally detestable. 
The fact is unnoficial hails are an important part of the game - shouting 'starboard', 'water',  'windward', 'don't go in there', 'keep going / cross (me)' and others isn't intimidation, on the contrary, it's often a courtesy and helps avoid collisions. If the rules say that something that's likely to reduce collisions and potentially damage or injury is intimidation or somehow unfair sailing, then the rules are an ass. (If that were possible ). 
Let's not list how 'qualified' we are to comment - if we did that, only Sten would be allowed to say anything!

Edited by Hector