Why not just not employ meshichists? (I mean this as question and in the most naive way possible.)
That assumes that the people making judgmental judgments about meshikhist Chabadniks are actually able to distinguish between meshikhist Chabadniks and all Chabadniks. Have learned from experience that many aren't. (And the emes is that until we connected ourselves with various Chabad institutions some years back ... preschool and the very special and holy and loving and wonderful Chabad rebbeim on the Upper West Side ... we couldn't distinguish between them. And a lot of folks in Rekhovot haven't figured it out either. And other places. ) And it assumes that if you went that step of not employing meshikhists, said judgmental people would care one way or the other ... some people just like bashing Chabad.
Am personally not pleased with the whole meshikhist thing, and find it leads to, well, people asking the kinds of questions that have been on this thread ... but have gained some patience with it over the last few years. We all do need the world to be fixed so badly, you know?