1) Simply ignoring/blacklisting someone only helps AFTER the fact, and only helps for verbal offenses. It also doesn't punish the offender.
2) Social shaming/ostracism doesn't work in an MMO, especially in FF14 since we have giant data centers and the ability to move servers. It's also generally against the ToS of 99.9% of games to name and shame. Interestingly, it used to work a decade ago because populations were small enough.