Here's a link to La Leche League articles on management of mastitis:
http://www.llli.org/llleaderweb/LV/LVMarApr93p19.html It mentions pumping for comfort. The only time it mentions dumping any milk is if the milk is to be cultured, the woman should pump and discard the first three ml in order to obtain a clean-catch specimen. Please do bring this up with your instructor or course coordinator-- even though you know better, your entire class has just been misinformed and will go out and spread that knowledge around.