Do you find a lot of people from the US tend to assume you have the same knowledge base as them?

Let me first say I am not racial profiling, and I don’t mean this to be construed as a slight to people from the US.

I find so often that people from the US assume that I know everything about their country that I do (and I’m not talking about writing aimed at US residents). TV, movies etc. often refer to brand names I’ve never heard of (I had to look up what Hershey’s meant).

When I was last on holidays, fellow tourists would introduce themselves as being from a particular city, without even first stating that they were from the US – some times I had never heard of the city, and still didn’t know whether they were from the US or Canadian.

For those of you that are not from the US, do you find the same pattern?