Virtually every viewpoint deserves a hearing. Welcome differences and use conflict. Disagreement means first of all the opportunity to learn about experiences and thought different from your own. Learning about different experiences and thought often serves to help you understand your own experiences and views more clearly. Be clear that your disagreement is with a viewpoint - not with the person's identity.
People often believe what they believe for some good reason.
Only after you have gone through these four steps should you raise your objections or disagreements with the other position. No put-downs of others will be tolerated. Especially in light of the fact that some of your fellow students are likely to hold views considerably different from your own, following these groundrules will probably be difficult. Silence and closed minds, however, are not the point of liberal arts education. I keep a running record of your grades, and it is easy to calculate your current average.