I had a tank who used a macro to announce which target he was attacking. Seeing so much blue text resulted in me tuning out of what was being posted, but after a while a whisper caught my eye and above that was a wall of "Attack Carrier Ziz!" "Attack Dravnian Outfitter!" "Attack Ice Sprite!" etc. Realizing how pointless this was I asked the tank if he could remove the party spam from his macros. No response, so I tried to blacklist him but it didn't work. I grumbled vocally about not being able to blacklist party members, he asks who do I hate so much I want to blacklist so I responded the guy who uses a macro spamming which target he was attacking. He explodes into a wall of insults against me calling me all manner of names, insulting me in 3rd person, and argued his reasons for using the macro was so that bad dps would know which target to fight. He still failed to understand that I was only referring to the chat log spam even when another party member pointed it out to him.