Well, somewhere at the same pages is written:
Don’t get too much on the nerves of the service staff, the other guests, or people on the street.
I asked a friend in Germany if this really the way they are talking to guests? To me it sounds quite UNfriendly. The friend said it were VERY friendly for the land of breweries, it means "DRIIINK and zip up"
As for the dope.... I know it's a taboo, DO NOT CARRY ANYTHING when heading to Germany. It depends on the people at the custom, some are very tough. When we travel in groups they ALWAYS and ONLY control the black people of the group. One friend was jailed in Germany for 2 years, caught at the custom!! Once in Germany, no one cares what you do (you'll find out soon.....) get your royal head and zip up, just what you do at home.