This country is self-righteous, arrogant, neo-nazi and deserves to be eliminated from the map. At the very least, greater chunks of German territory should have been given away to the Allies (Dutch, French, British). Germany should have been left with nothing. It is a backward, totalitarian, non-democratic hellhole which has no respect for fellow human beings.
Since excellent goods and products are made by numerous other countries (US, China, Japan, Korea, Finland, to name a few), boycotting German products is a relatively easy thing. This is the best way to teach germany a lesson (of course they will never learn), since their economy is completely dependent on exports and completely dependent on whether or not other people in other countries want to buy their overpriced crap.
Also, do not ever travel to Germany or pass through Germany in a flight stopover. Indeed, Germans are very nice to tourists because they want their money. But remember they hate you behind your backs.