Obviously forums are different - and Pet Talk is a very nice one.
I was always convinced that US-Americans and Canadians are so much nicer but now I would say the bigger a city is the closer it comes to Europe. I feel that in Europe people are breathing down each others neck much more and that makes them more nervous and more aggressive.
When I have visitors from overseas I always tell them our waiters are grumpy (which IMO they are) and then I come in with my visitors and we meet a very nice waiter who tries to speak English and is very friendly

I don't know any German who thinks of himself as part of a master race. I am sure there are some- but I don't know them. Right now I would say there are not more racist people in Germany than in any other country of the Western world.

About the Germans who misbehaved in Italy: obviously they have been very stupid. If now in Italy you buy fake goods you can get fined really high fines. Italian companies like Gucci don't like to see their purses and watches for 20 bucks- so you better shoo all the sales guys away or you may have to pay 2000 bucks