Menachem Shmei denies that Lubavitchers think that they are the “Master Race” of Judaism. Let me provide two anecdotes.
Despite these anecdotes, my previous point remains: Lubavitch is a derech, not a race. Those who adhere to this derech obviously believe it is the best one, just as the adherents of Satmar believe that theirs is the best derech, or else they would leave.