If you don't want to see his posts, block him, arguing makes it worse.

As for the droppable items, I don't know why there are some droppable and some undroppable besides holiday items (which I think shouldn't be droppable as those are limited-time items). Either items should all be droppable or none should be droppable, because then there is this argument or debate on what should be droppable. In my opinion no items should have been droppable because thy should be earned, but hey since things are droppable it can't be changed otherwise people will complain more.