Assalamu Alaikum
They hate us cuz they can't be us! Jk
I don't think there's any benefit in discussing why there's any animosity or hatred in the ummah. There's a lot of division already. Members that benefit from one forum may not feel like they can benefit from the other. Some just have too much time on their hands to be nitpicking at other forums, Allahu a'lem.
We should all strive to be better Muslims inshallah, seeking the best interests of our iman and accompanying ourselves with good knowledgable Muslims. I think IB has done great in facilitating a positive environment where learning can be achieved inshallah, regardless of what you follow. WE all have to be sincere in our advice to each other. Getting the facts straight and then offering constructive criticism is better than making assumptions and bashing other people's hard efforts. May Allah guide us all ameen.