People like this are jerks who only share their library with people who already have ultra rare shit. They want to trade rare for rare.
They think they are special for their collections and their actions are anti-thetical to the entire piracy ethos.
I would ignore them and keep searching for another source because its unlikely you have anything they will willingly trade for.
It's dumb and I can't stand those people.
But it makes me laugh when they have their collections locked up but other people are freely sharing what they have locked up.
The stuff I don't want to share... I just don't share at all. No reason to make it frustrating.