Answer:
The teacher is blindly biased towards what she perceives as the only 'American culture'.
Step-by-step explanation:
Ms. Wilde is clearly an example of an educator that is a little behind the times. All of her education material is based on the reality (most likely) of the world she lived in while growing up. She fails to realize that she now lives in a multicultural country and must make adjustments accordingly.
The tortilla scene is a perfect example of a lack of multiculturalism. Tortillas are one of the many food that are widely consumed across the United States by both people of Mexican descent and people with not a trace of Mexican descent. Tortillas represent a cultural commodity that has become part of a very 'American' cuisine that is Tex-Mex.
Regardless of the origins of the tortillas, the rejection by the teacher of something she does not eat is closed-mindedness. The assumption that because she does not eat them, neither do the rest of the students is a lack of openness and multiculturalism.