Quote Originally Posted by IndigoHawk View Post
When you reach this level of choosiness, it's time to start using a guild or a channel to organize groups of people you trust. Putting more and more checkboxes into the game isn't the only way of organizing. You can also meet people, decide if you want to group with them again, and go from there.

Party Finder already has too many checkboxes. It could basically have two options for "relaxed" and "serious business".
This post summarizes what should have been said from this topic. There is currently no fool proof way of filtering out people as several of the previous posters have pointed out the loopholes of OP's original suggestion. The rationale behind it is clearly understandable but it would be difficult to force implement this as a system feature.

You would be better off to do some networking and probably get invited to some of the farming LS where people who are decent enough gets in for the sole purpose of painless farming.