*imagines masses of Germans with german and other flags walking down the Streets of Berlin*How would Poles react?
Considering that numerous Polish patriotic groups work together with German, Swedish, French even Russian ones they'd likely say good for you for finally standing up to pc Marxism and agree that Germany ought to be for Germans, not millions of third world migrants. If anything, they'd applaud the German people for finally standing up for their culture, identity, country, etc.
Just ordinary, patriotic Poles:
You act as if only male neo Nazis and such attend this. Lots of families, old people, young people, women, etc. It's not just far right young men who attend.
youtube.com/watch?v=Z4UBVMzyw6w - video of various people at the march. There's far more ordinary Poles that march with Polish flags than narodowcy with the falanga and anti Multikulti banners...
youtube.com/watch?v=3wa_fLBetGU tommy robinson at the march last year...
Why are so many people not living in Poland obsessed with trying to equate them to real Polish heroes?
No one's saying they're heroes, they are however patriots and love their country. I could ask why so many non-Poles are against Polish people marching on their independence day?