So if one person is being a dick, it's okay to be a dick to them? That doesn't work; now there's just 2 dicks. Nothing good is achieved.
Edit: You realize the quotes from before were things you said right? You've already gotten bitter over this, and were pretty hostile towards a very generalized group of people. I agree that courtesy would probably get better results. You should try it. Stuff like "be courteous or someone should kick your ass" doesn't fly for reasons I'd assumed were immediately apparent.