“ I asked her if she was taught in yeshiva that Lubavitchers are better than other Jews”
The only reason you are upset about this is because no one is saying you are the best Jew. Your gaavah is so strong you think you know better than your own gedolim, those whom have not condemned ChaBaD as idol worshippers Chas v’Shalom.
I’m having trouble not believing you are not a 14 year old Bochur at this point.
My 15 year old son has most likely studied more Torah in a Lubavitch mesivta than you have in your life. It shows when you can’t even engage in a proper Torah discussion with Seichel.