I am German and most of my family and friends comment on these:
Lovely countryside but it rains all the time (that latter one is wrong I think)
Why have pubs so weird carpets?
Again, the Brits are blocking all the sunloungers
You are always drunk after work.
Too many girls are pregnant while still in school.
Why do children eat dinner at 4-5 and parents when the kids are in bed? And, why do you feed children rubbish instead of normal food (a friend shaking her head at the children menu in a restaurant)
Why do Brits see themselve as special and not part of Europe?
Shaking heads about two tabs in the bathroom sink.
The underfunded and in their view oldfashion and basic NHS and why it is not possible to just see a specialist without making a huge dance and a hospital appointment.
That I didn't have a room with en-suite when I was giving birth to DD, either single or double, and had to go up to get breakfast in the corridor.
The horror that DD had to start school with 4 and had to wear uniform.
I think lots of things are seen more as eccentric and worry that we are not really sane.