I get why people react badly to you. The fucking Horst Wessel Lied?! It's an (if not *the
anthem of the Nazis. Neonazis sing it. In Germany it's forbidden by law to sing it. Just thinking about makes me sick. It's not a good thing. You shouldn't be surprised if people accuse you of Nazism if you keep sprouting that kind of ideology and use those symbols. A shaven head doesn't make you a Nazi... the ideology does.
Be proud of Germany. But why don't you be proud of the Germany of today? Why keep grovelling to a group of criminals and cowards of more than 60 (!) years ago?
Germany has become a good, strong country. It should be appreciated for what it is today, not what it once was.