Actually, easy solution SE should be able to implement: let us filter PF listings by ilvl. We can already hide all the listings for duties we haven't unlocked. Why not expand that to listings where we don't have the gear to meet the requirements?

Either they'll all continue as usual and we'll all be blind to their listings after filtering them, or they'll be forced to lower their ilvl settings, allowing us to troll them back by filling their parties and removing the listings.