I think that your professors have been awakened to their own feelings and biases. This made them uncomfortable.
While I agree that homophobia is emotionally charged and reactionary, I feel that heterocentric is not. Heterocentric is neutral in it's flavor. So if a person feels emotionaly charged by this term I feel that it reveals the underlying homophobic undertones the professor who is consciously or unconsciously adding transferrence into his scholastic criticism.
As a counter criticism you could invite them to search within themselves with curiosity for the possiblity that transferrence did color their criticism as an exercise in intellectual insight.
Love and affirmation,
Forrester Tongpa Nyi (formerly Ash Phoenix, faeries evolve! )
When you come to know that your entitlement to joy is a given, All that remains is the exploration of the many different ways to let it in