Why can't I blacklist someone while in Diadem?

[Araxes]

Don't take this statement the wrong way

But if you have to blacklist 200 people that easily, I think the problem might not be them...

Well, over all those years i met quite a lot of people i do not sync with, to say it lightly, yet my Friendlist is also always full or on the brink of being full. Both lists are to small