There are many negative implications. This backlash fails to recognize that access without affirmative action supports the existing power structure and those in power tend to promote, hire, and praise individuals similar to themselves. The anti-affirmative action movement ignores the inherent racist undertones of this society and the continuing need to remedy the problem. For example, this movement endangers programs such as bilingual education that enhance chances for access. In a vacuum, yes.
Teachers impose their own culture by the manner in which they teach mathematics.
This is very subtle. However, it could be as blatant as assigning value to certain ways of thinking about mathematical problems or to styles of description. People tend to respect or favor students who are like themselves. In particular, language differences present real barriers that are deeply rooted in culture. Students should learn to be critical thinkers in our greater society.