Okay. Since this whole post is one question it makes it easy for me.
This iRP "hate" started from the very beginning, before the BG was FIRST created.
The first transmission to Sapphire Raven from Joker HERE (The actual post) led Joker to believe that Nomak is closely related to the nomads, not mattering if its an alliance or simple ass kissing.
After things happened and I took a small break (along with removing the BG), I remade the Blackguard lore a bit which, was connected to its original lore from one year ago. Knowledge and any other information is what The Blackguard has from its Core days.
Knowing that Joker decided to go onto the nomad side by attempting to kill off BG members iRP, Tia remakes the BG and moves on with the work. That is where the BG and the Commune first met while I was on Joker's ship.
The report gave out information that you were nicely talking with Joker, then asking a BG member if we hunt nomads. (That is the important part). The whole BG basically knows, iRP that you guys are nomad lovers thanks to all the RP done (Even if its a small amount), along with the nice encounter in Delta where you protected an LSF vessel considered as a Wild/Nomad ship. This is where actual hate started. Along with that, Tia does not like Outcasts. Personal reasons. Since your ID and IFF reeks of them, there is enough reason to do that too.