If you care tremendously about who specifically your ancestors were, you may allow that to define you as a person to some extent. And if then, for whatever reason, I happen to not like you as a person I indirectly then judge negatively the person you've become because of who your ancestors were.
If, however, you don't really care that much about who your ancestors were, you will define yourself and become the person you become independent of who your ancestors were. In that case I will like or dislike you entirely without any correlation to who your ancestors were.
So I say, for all those folks involved, let's not get too hung up on dead people with whom we share a few genes.
