Theory has it that visiting foreign people might make us wiser.
By seeing how each of them cope in their own environment we might learn the beauty of each culture.
By taking in all the differences between us we might learn how ultimately alike we all are.

Or not.
The key word here being ‘might’.
Whenever subjected to a learning experience we only might become wiser.
Being confronted by new information is only an opportunity. Not a all a fatality.
Integrating that new information into our personal library of ideas has to be preceded by a ‘digestion process’. We need to understand and accept each of them first.
Depending on various factors, some of us might remain indifferent to at least a part of what is going on around us.
Depending on various factors, some of us might reach a different conclusion starting from the same set of raw data.

The fact that each of us has a determinant contribution to the learning process explains the differences between our perceptions.

Whenever visiting a foreign country, each of us comes home with a different opinion about those places.
The fact that none of us remains indifferent represents our shared humanity while the differences illustrate the individual nature of the human species.