My pet peeve is when you are selling a pink, someone enters trade and wants to buy with greys as currency. They don't give up either. They message you and send you friend requests until you have to /ignore them.

My other pet peeve is people spamming what they are selling and buying while i'm trying to host a good farming game. People end up going busy and what not mid-game while my pots are going and i'm trying to keep their characters healed.