Why do many think Germans and Slavic people act rude and pushy?
I am not sure if you had a chance to meet any German or Slavic people. There are rude and polite people everywhere. It does not depend on national or ethnic origin. I am originally from Russia, speak Russian, English and Spanish and as a merchant seaman traveled all over the world. So, my answer is based on personal experience, not on gossips or preconceived notions.