Answer: out-group homogeneity
Explanation: Dionne is displaying out-group homogeneity which is defined as the tendency for members of a group to see themselves as more diverse and heterogeneous than they are seen by those of outgroup. Put in a different light, it is the tendency for individuals to view members of outgroups as being more similar, or homogeneous, than members of ingroups they belong to. Dionne perceives that all people from other countries (outgroup) are similar; however, everyone in France (ingroup) has different attitudes and behaviors. This is an example of out-group homogeneity.