It's still rude to tell someone that they are wrong but refuse to tell them why. I understand that the other side is not helping by consistently misunderstandi

It's still rude to tell someone that they are wrong but refuse to tell them why. I understand that the other side is not helping by consistently misunderstanding everything. At some point, if I was representing the GPL side in the argument, I'd realize that my attitude is not helping the cause and I would either change my attitude or ask another supporter to take over in a more polite way. It takes energy to remain polite and nice in such discussions, but that's the price for convincing people. Otherwise, you are just an arrogant brat, even if copyright law is on your side (think RIAA - technically, the law is on their side).