Final answer:
Natalie's opinions demonstrate prejudice, which is a negative attitude towards individuals solely based on their group membership, without personally knowing them.
Step-by-step explanation:
Natalie's opinions can be BEST classified as demonstrating prejudice. Prejudice refers to a negative attitude and feeling toward an individual based solely on one's membership in a particular social group, without knowing them personally. This is different from discrimination, which involves actions based on prejudiced attitudes, and racism, which specifically refers to the belief in the superiority or inferiority of certain racial groups. In this case, Natalie has formed a prejudiced opinion against all French people based on a negative experience with one individual. Assimilation is unrelated as it involves adapting to a different culture or group, not forming negative opinions about them.