Zarefsky is one of the leading scholars of argumentation, so you should be in good hands, although nothing can recreate the benefits of an actual classroom. There's also a good introductory book by James Herrick that would prove useful (a lot off people push Jay Heinrich's Thank You For Arguing but he misses the mark too often for my taste).
I know you will undoubtedly disagree, but I'm actually trying to help you. The argument you offered that kicked off this thread is inherently fallacious. If you tend to argue in a similar fashion in other aspects of your life, you're not doing yourself any good. I also realize that you think I'm an idiot and in the wrong, but I actually know this stuff pretty well. Improving your argumentation skills and avoiding the pitfalls of logical fallacies will only benefit you.