While I second this, there is easily missable feature in friend list that I have found to slightly alleviate the trouble. Right clicking a friend on the list you can assign it to a friend group, and you can rename the friend groups. I have few different base "category" to remind how some have ended there. Sadly no such feature for blacklist. Even if note would be a hurdle, server space wise, at least give us blacklist grouping too, to separate gold sellers, and other masters of "I don't like you".