Serious question:
Do Lubavitchers really love all fellow Jews?
Or is it just something to aspire to, and really you dislike some of them?
The Mitzvah of "ואהבת לרעך כמוך" Is deemed impossible in the plainest sense by many, including the Ramban (iirc), and instead is seen as a general Mitzvah which incorporates numerous types of acts of kindness, such as bikur cholim.
However in perek ל"ב of Tanya, the Alter Rebbe asserts that not only is the Mitzvah possible, but using the methodology outlined in the preceeding chapters:
"is a direct and easy path toward fulfilling the mitzvah, “You shall love your fellow as yourself,”1 with regard to every Jew both great and small—in spiritual stature."
הֲרֵי זוֹ דֶּרֶךְ יְשָׁרָה וְקַלָּה לָבֹא לִידֵי קִיּוּם מִצְוַת "וְאָהַבְתָּ לְרֵעֲךָ כָּמוֹךָ" לְכָל נֶפֶשׁ מִיִּשְׂרָאֵל – לְמִגָּדוֹל וְעַד קָטָן.
So as Lubavitchers we believe it to be possible, and striving to do so is a most fundamental part of being a Chossid. Do we all achieve thatt? I can only speak for myself, and, quite frankly, no.
On Sukkos it is our custom not to sleep in the Sukkah, being that G-d's presence is resting there, it would be painful to sleep in the presence of G-d, and one is exempt from sleeping in the Sukkah of it causes discomfort.
Now, the obvious question is why do the Chassidim not sleep in the Sukkah? For the Rebbe, who feels the presence of G-d, one can understand it causes discomfort. But with all due self respect, Yehuda57 don't feel nada. But here's the thing, even if I don't feel G-d's presence, I know it's there. And going to sleep in that presence would pain me that I don't feel it, or it would pain me that it doesn't pain me that I don't feel it.
Just like I can be pained for not feeling that which my Rebbe can feel, i can work that positively as well. Even if I'm not on the pathway the Alter Rebbe describes as easy, by knowing it is achievable, and knowing that my Rebbe is on that path, I can tap into that and at least achieve some of the pure unadulterated love of my fellow for some time.
Obviously, this is all בדא"פ, and I eagerly await strong rebuttals from people who live me dearly on a soul level.