Thanks! Sorry for not replying sooner. Life was so stressful these last few days. Anyways, this is such a hard question and I don't have an original answer for this. I obviously hate Moash (like probably most people), but I probably hate Zane even more. I especially dislike Zane, because I feel like he doesn't add much to WoA and could've been left out. In my opinion, it might've benn a better bookmwithout him.
But the worst might be Straff! It think I actually hate Straff the most. He has no good qualities at all and I feel like there is a no discussion possible here. Moash has at least the potential to be redeemed. (But he was definitely an important person in the books.)
As you can see, I mostly dislike the characters Brandon wants me to dislike. In general, I always like the "good guys" or just find them annoying, but don't actively hate or really dislike them. An example here would be Wayne. He really doesn't click for me and there are many instances where I am annoyed at him, but I also wouldn't say I dislike him. The same thing applies to Shallan.
That's amazing! We achieve Cosmere world domination one person at a time.