Since I do know Traffic Hamburg personally (in Real life, that is), I can confirm that he does not intend to starting a fight like this. He usually tries to help, but as he stated, his english is very rudimentary only. This, and the fact that he is of course annoyed having to say the same thing again and again may have led to your perception that he treats the participants that are not doing right in a rude way.
Afterall, I think you are both correct though. The image was uploaded later, and until that point you were not playing after the rules. Why should he wait until the deadline to tell you then, if he can already do it right away?
But also, of course, you can clearly tell that he is annoyed. But as Licaon said, there are differences between the people of different nations: while an american might still be overly friendly the german is already furious
My opinion as a german (who did spend three years abroad): Traffic Hamburg did nothing wrong in pointing out the rules. He could have been more friendly, of course, but why should he. He has got other things to do, as well as you do, and being friendly can be quite challenging, especially if you are on the leave, but still wanting to help.
It is a way of the internet to overreact, which both (Traffic Hamburg and Remi Gio) of you did. If you are angry at him, all right, but I don't see any reason to be leaving the contest just because of someone doing his job and nothing further. Would you expect the cashier to be friendly and ask about your day? No.
In the hope that this forum will return to its peaceful state that it once was in,
Greetings from Schleswig-Holstein