*sigh* I hear ya.
I'd say that if a person is truly secure in his/her/hir identity as a dom(me), sub, whatever, then the fact that other people do not categorize themselves in exactly the same way shouldn't make any difference. And one won't ever been viewed as the Most Dominant Dom of All or Subbiest Sub Ever by trying to negate the choices of others. I think that dom/sub tendencies, like gender identity and sexual orientation, can be far more fluid and less a matter of "either/or" than is commonly believed.I think one of the reasons why switches are looked down upon may be that they are crossing the neatly drawn borders between subs and Doms and by doing that they "threaten" some peoples' image of themselves, or even their identity.