Answer:
discrimination
Step-by-step explanation:
Discrimination -
It is the activity , by which some specific people are treated unequally or indifferently , that could be on the basis of caste , race , gender , color etc. , is referred to as discrimination.
Certain people are given treatment different from others , in public place or in society .
Same case is given in the question,
where Mona does not entertain any non - white person, depicting the activity of discrimination .