Anderson's friend was making suggestive comments about a classmate, but Anderson refused to acknowledge his remarks because they were crude. This describes a(n) challenge associated with listening.

Ethical challenge

Explanation:

Many health professional deals with day to day ethical challenges in different ways. This happened in an informal, implicit and reactive manner. There are many different categories in which health professionals face ethical challenges. Future research and professionals should focus on ethical services. Ethics reflection and deliberation will respect when dealing with ethical challenges. These will devalue the disagreement in constructive ways  

Thus Anderson's friend was making the suggestive comments about their classmate. but he refused because they were crude. This is because of ethical challenges.