Well, the polish government has certainly been busy hatemongering
Nope. Polish goverment was defending Polish nation from attacks made by German nationalists in political parties, government and media. German media like FAZ or SZ in particular consider every defence of Poland "hatemongering" and every criticism of German nationalism "antigermanism". They are pretty nationalistic themselfs(particulary FAZ).
There's plenty of opposition to that particular group.
How big was opposition to Stoiber's award to former Waffen SS member that served in elite Hitler bodyguard unit ?
How big is opposition to racist jokes about Poles in Germany that are shown in TV?
Moreover there are far more nationalists in Poland than in Germany.
and I can prove it easly. There are no Polish parties that call for annexation of Ukraine, Lithuania or Belarus. Furthermore Poland has excellent relations with both Lithuania and Ukraine, something Germany can't tell for its relations with Poland. There no such people as "Polish Steinbach" that would attack Ukraine or Lithuania.
There is a legal party in Germany that calls for annexation of Poland.
And here is their map, straight from their official page:
In the Eurasianists’ view, it was Tatars – to be precise, the Mongols of the 13th century – who laid the foundation of Russian statehood, culture, and, to some degree, even ethnicity.