Trolling

You have two options really

• a) Go into quick drop settings and set visibility to 'Mine Only' so you never have to deal with the possibility of this again. Then, report the person responsible
• b) Hover over the item in quick drop, click the left stick in and then block them to hide everything they personally place down forever. And of course, you can report them if you like.

I think those measures are sufficient, it leaves it entirely in the player's hands to deal with how they want. And obviously, if someone actually finds it funny or amusing that they keep getting sabotaged by another player, they just do nothing and enjoy the chaos. 

I report all those people who are blatantly trying to troll and also turning off either individual quick drop objects or turn off all other player objects.

I'd much rather deal with doing that than full circle adding restrictions on where to place quick drop objects because no one wants a system like that.