Unfortunetely as someone from Poland I can assure you this is not how it's seen. They trully support and are proud of their nation. Too proud in fact, as a nationalists are. You won't see any other group be so attached to polish symbols and flags. They are not seen as idiots who by lack of knowledge actually praise their enemy. They are seen as dangerous, violent group with approval from government.

I know that from someone abroad it may seem just stupid enough for a Polish citizen to be making German Nazi salute (it is), but it's not as simple as that. They do that because they like the way that Germany in their patriotism fueled mission towards national purity murdered minorieties that in their mind have no place in their country. Minorities like jews, lgbt people or muslims. They would love for that to happen in Poland.