Schopenhauer must have been a real buggerbear to deal with.

By the way, of his 38 ways to win an argument, many are just ways not to lose an argument. That's bush league!

For instance:

38. Become personal, insulting and rude as soon as you perceive that your opponent has the upper hand. In becoming personal you leave the subject altogether, and turn your attack on the person by remarks of an offensive and spiteful character. This is a very popular technique, because it takes so little skill to put it into effect.