The rage may be too much but the taboo on taking photo that is real and cultural normal that will be enforced or made to feel embarrassed for doing (i.e. 'lets not be the stasi'). That's the cultural norm of there and that scene. You visited from the states, correct? Bay area but the guess "small negative experience" - the idea of we are going around experiencing things and our life is a product of these experiences we consume and interpersonal politics - that's very california "the personal is the political" or that it's some how a consumption experience we "have" and who we "are" is coloured by these "experiences" etc (a fish in the water "what is water?")
One thing in German culture I very appreciate (as australian) is the "polite complaining" as in - you know a German cares if they will share with you what is wrong (and then they will have solution) as Australian we just complain about the big things (but never on your mates or people on your level) hehe "the government" etc - German - politely complain (and here's the patch) etc hehe In both cases it's a sort of affection or closeness if they tell you what they really think
it's not seen negative it's seen like 'of course we have feelings good and bad' etc
All generalising of course.
This could I see easily clash with american culture where often it's positivity all the time and it's seen taboo to say something bad - as if it's letting down the 'team' or it must be personal again 'you' or something - where as kinda truthfulness and integrity seen as the thing there - say as it is or as feel etc
Also another thing you might notice (probably less in Hamburg but in Berlin or something) in winter you want to go for a swim - that's the spa. Everyone is naked. This can come a shock to, say, a culture like the US that had the puritans - that people being naked is not sexualised any way. Actually the US because the norm is "naked" = "naked fun" that can lead to perhaps the most confusing cultural mishap. This might be related to photos also. For instance - in Australia it's increasingly less common people sunbath naked. In east europe and nordics - being naked in spa is just common.
Also: new years eve - they try to blow up everything. In a civilised city it blew my mind to see folks firing guns in the air.
Yes! There's some differences.
Saying that: there's assholes everywhere and don't let the 5-20% allocation of asshole influence your opinion of the 80% of the cool calm quiet
Hmmm... this comment is long... I may be the asshole. Ok,
Ciao