Why did many Russian hate anyone or anything that was German?

Answer 1

Russians dislike Germans mostly because of the First and Second World War but also because of earlier history.

The Teutonic Knights crusaded against Russians.
The Russians and Germans competed in the Baltic
The Prussians and Russians formed within twenty years of each other and were neighbors.
The War of the Austrian Succession and Seven Years War had them on opposite sides.

In World War 1, the Eastern front was incredibly bloody and long-lasting.
The Russians carved up the historic region of Prussia and cut it off from Germany.
The Nazis were fascists, which means they were corporatists, whereas the Russians were soviets, who were communists, the antithesis of corporatist.
The Nazis backstabbed the Soviets and attacked Russia.
The Germans invaded Russia and killed and raped millions of people.
The Russians invaded Germany and did terrible things to the populace.
The Russians formed a separate German country, East Germany, and occupied half of Berlin.
Volga Germans and other Germans who were in Communist countries were killed or forced out of their homes to East and West Germany.
The Russians occupied the historic capital of Prussia.
The Germans were part of NATO and therefore directly opposed to the Warsaw Pact
German leaders are generally critical of the Russians.

On the other hand:
The Prussians, Austrians and Russians cooperated against the Polish-Lithuanians.
The Russians and Prussians were allies against Napoleanic France.
The Russians allowed the Prussians to unify Germany.
The German and Russian empires were early on friendly.
The Germans, Russians, and Austrians formed an alliance, the League of the Three Emperors.
The Germans helped Lenin to return to Russia.
The Weimar Republic and Soviet Union were on good terms.
The cooperated to cut up Poland again.
The Soviet Union allowed East Germany to reunite with West Germany.