Or maybe stereotypes that other people think exist that really don't...
For example, people in Canada have the idea that Americans think Canadians all live in igloos...but we don't...we assume everybody in Alaska lives in igloos (or at least I did), I never thought of Canadians as occupying them.
Also, Americans are supposed to assume that all asian people are Chinese, but I always assumed they were all Japanese.
What are some stereotypes that you got wrong?