Cultural stereotype
Are you relying on a cultural cliché?
When talking about a person or a group, appreciate them as individuals with their own cultural identity.
Basic Example

Advanced Example

Punctual Germans, polite Japanese, argumentative Italians:
Generalizations can be well-intentioned. But they fuel
prejudice and discrimination, because they reduce people to
arbitrarily ascribed characteristics. Cultural stereotypes
can also be an expression of ethnocentrism - a way of seeing
the world solely from the perspective of one's own culture,
customs and values. This can isolate and alienate people -
and adversely affect the working relationship.