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Why are Poles/Poland disliked by Germans? [140]
It is natural for a person to dislike their enemy with whom you wage a deadly war.
Unlikely. If you ask most Germans below a certain age, they are rarely aware e.g. about the former German territories. The German article you linked gives imho the most important reason, there is still relatively little exchange between both countries - aside from those who emigrate for work. The language barrier is an obvious problem, and it will take time to change this. Both countries have increased their school and university exchange programs, so the next generation will feel more connected.
That being said, it is not surprising that the current view in Germany is not very friendly towards Poland. I mean what kind of news is the average German likely to hear from Poland? He hears about how PiS is undermining the rule of law, is pointlessly antagonizing Germany over long solved issues (e.g. reparations) and the refusal to help during the refugee crisis has also not gone over well.