“I do not feel superior because I'm vegan. The truth is I am vegan because I do not feel superior to others.” —Michele McCowan.
It’s more accurately a principle that we shouldn’t subject anyone to our wants and/or needs.
The bottom line isn’t whether we believe ourselves to be better people. The question is not what we are, but what we think, and what we do as a result of what we think. The issue is about ideas and behaviors, not people.
Those of us who reject cannibalism do not think we are "better" than cannibals, do we? We only believe that there are ways of acting that are better than others according to ethics.