If he is especially pleased when mexico wins and the mexican flag is waved. he feels pride in his country and in its heritage. the term that sociologists would probably employ to explain his reactions is: nationalism.
Nationalism can be defined as the way in which a person tend to cherish or love their nation more than other nations and this person tend to have the best interest of their nation at mind.
Based on the scenario the reaction that was display by juan is nationalism based on the fact that he often feels pride in his country and in its heritage.
Therefore this is an example of nationalism.
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