Rather than placing the responsibility on Square Enix (yes, they should really be the ones handling this problem, but let's face it - they're not going to), why don't we have some changes made to the blacklist system?

Change #1 - If you want more blacklist slots than the game provides by default, you can opt to have the blacklist data stored locally on your PC/PS4 instead of the Square Enix servers. Think your hardware can handle a million people on your blacklist? Go ahead and try it!

Change #2 - Blacklist affects more than just chat. Blocked players will never have their party finder entries appear to you ever again.

At least, at that point, I won't be angry every single time I open the party finder. Out of sight, out of mind.