When someone says something along the lines of:
Well I don't agree with you, because you're a typical so-and-so X.
X being the culture/group of people.
If you make a reply along the lines of:
Wow, what a stereotype! I can't take you seriously.
Are you implying it's "sort of" true? Because the definition of a stereotype seems to state there's some accuracy to a stereotype, unless I'm completely interpreting the definition wrong.
a widely held but fixed and oversimplified image or idea of a particular type of person