Whether it's a caustic lie or a caustic truth, it's still caustic. Either way, what good do you see coming of its revelation in this context?
Either OP changes his behaviour to better-please his colleagues, thereby improving their work dynamic, or he cuts them, thereby improving his circumstances. Without accurate information, he's unable to make an informed decision.
I personally believe truth to be more important than happiness, and I would want to know the truth even if it made me unhappy. Other people might prefer happiness to truth, which is fine, but that's not what I would choose for myself.
Edited to expand: I already sandbox my personal and work lives thoroughly, so it's not going to cost me anything of significance beyond the job if I lose the job - not that that's not significant, but it's not my whole life, either. If, to a good first approximation, everyone where I work hates me, then I'm already going to lose the job, because with that many people looking to put a knife in my back, someone is going to succeed.
The odds that knowing this is true will make it possible for me to change it are effectively negligible; on the one hand, if everyone where I work hates me because of my own behavior, I'm not equipped to change anyone's mind, and on the other, if everyone where I work hates me because of something that isn't actually under my control, everyone where I work still hates me and I'm literally the last person in the world who's going to be able to do anything about that. Either way, I'm screwed in a way that foreknowledge isn't going to do anything to help; the best that'll happen if I find out ahead of time is nothing, and the worst is that I'll make my situation even worse. So where's the benefit in being told?