Of course the homosexual community is offended by this. Even if they don't know what the context was in which this professor made these rules. Consider the recent tabloid case of Perez Hilton. Hiltion alledgedly got clocked by someone in a bar, because Hiltion (who is gay) called the dude or one of his associates, a "faggot". Hilton admits he did this. Now compare what Hilton did to what Miss California said, that in her opinion, marriage is between a man and a woman. Which action deserves the most outrage? Now, ask yourself which one the gay and lesbian community are likely going to focus on, and be most upset about?
It's because it is all political theatre, that's all.