Haha looks like I am the first Swiss guy commenting that thread !
I'm going to LA in two weeks, this will be my first time in the US so I can't do any comparison, but all I can say is : be yourself. We really don't like fake people (who does ?) and prefer having a few good friends than knowing thousands of people. The gay community is pretty good, at the beginning try to meet some guys just for a coffee or a beer (as friends), no date no sex... I would build my own friends circle before having sex with anyone, just because they all know each other
Many here seems to answer the question "how to be a good Swiss guy" but it's about being a good American in Switzerland
I think I can say we love Americans because you're usually joyful, so don't try to be like every other Swiss people, just try being yourself while respecting the main cultural differences you could come across.
All in all we are not that bad haha ! If we are demanding it's because we want to be able to rely on people... And if we are disappointed by someone we'll show it
It's really al about being genuine and respectful.