Arso,
“That is until Lubavich, in their great humility, decided to use it for themselves.”
Is calling ourselves the chosen nation arrogant? No because it’s much more of a responsibility and liability. Taking the title of Nassi means taking responsibility to be there for every Jew in any way needed. If you feel your Rebbe behaves in this way, feel free to call him nassi too. I really don’t care.