Lorena Li:
I also think it's weird because he's so powerful. Almost nothing can affect Bai Jue. But I believe it's because he hasn't fully regained his strength. Even so, I hoped he wouldn't fall easily.
If he’s poisoned that easily the only reason would is if his strength is still low. However as calm, aware and in tune that he is, I believe he allowed it to draw out all involved in doing evil and hurting Houchi/Shanggu. At the wedding he looked like he wanted to choke her and her momma but he had to stay calm.
Also if he’s easily poisoned and dies then his plan is useless so I’m hoping he’s just acting to draw out the evil doers. I don’t know what the writer is thinking but this stuff may be for extra drama and to give Shanggu time to recover as well while Bai Jue is weeding people out. We will see