Sorry for my five-cents' worth thought, but reading the question posted reminds me of a question that was thrown to me when I was participating in an inter-religious dialogue with people from other religions. I was the sole representative of Buddhism in the dialogue and I make clear that I am from the Theravada tradition. Another person who seems more knowledgable about other religions asked me: "As a Theravadin, do you find it offensive when the Mahayanists call you a Lesser Vehicle?"
I replied, "That label seems to me quite contradictory. Mahayanists pay much attention to emptiness and non-duality; they are careful in elaborating the teaching so that it does not seem to show any conventionality and dualism, but rather reflects transcendence. By applying this term "Lesser Vehicle," it merely contradicts all that they have preached. You can show your superiority but when you do that at the expense of the others, you only contradict yourself."
But anyway, I find all the posts above rather interesting. Of course, to me, though as a Theravadin, I don't really care what the Mahayanists want to call me; most of the time, when this issue arises in my conversation with other Mahayanists, I often point out its contradiction and the issue ceases.