Sorry but what do you expect when some-one jumps in & insults a large portion of hunters on this board with such a completely narrow minded opinion ?
I expect you to attack the idea - not the person.
For example - i might point out that virtually all hunters can practice up to hit the vitals of a deer at reasonable ranges shooting offhand - therefore it cannot be considered unethical.
I might point out the 'pie plate' theory - and tell him any hunter that can put 3 consecutive rounds inside a pie plate offhand is ethically able to shoot offhand to whatever range the pie plate is. An ethical hunter might put plates at 50, 100, 150, 200, 250 etc. Whatever the last plate he can easily put 3 rounds into is, that's the distance he can shoot offhand ethically to. It's pretty hard to argue that.
I might further remind him that while some areas of the country tend to offer lots of impromptu rests (bc does) some areas don't. (manitoba comes to mind).
I might even offer to take him to a range and show him some offhand skills - perhaps no one has ever taught him the art of offhand shooting. There's lots of tricks that make it easier, like introducing a little motion to control the motion (do a small circle, let the crosshair fall on the target... etc)
I might question WHY he thinks it's unethical... perhaps he's under a misconception.. or maybe he's even using the word wrong. Maybe by 'offhand' he means something slightly different than we think.
I might even discuss the concept of what IS ethical. I personally feel that we owe it to the animals to take only shots that have a high likelyhood of inflicting a quickly-fatal injury .. would he agree that if it can be demonstrated that offhand shooting indeed does represent a very high likelyhood of inflicting such an injury that it must therefore be ethical?
What I WOULDN"T do is call him names.
I might say i think he's mistaken. Or that his reasoning is flawed. Or that my experience is different. Yadda yadda. But i wouldn't call him names.
See the difference? There were DOZENS of possible responses - each which attacked the concept the poster put forward.
And some newbie reading the board would actually LEARN something from your response. Instead of just reading yet another fight. Hell - I might learn something, maybe you've got some offhand trick that'll improve MY game... I'm happy with my offhand for the most part, but it's never a bad idea to get BETTER at it.
Attack the idea. Not the person.