Honestly OP, I think you're fine. Perhaps it just means the person you were disagreeing with is not a viable RP contact.
Some people do get worked up about seeing "imported names" from other characters/stories/etc, so I can understand if they're getting caught up on that. But at the same time, why not let them do their things and you do your thing? I don't see many people who are really gonna try to pull out a kanji dictionary and fact-check a name. That time is way better spent waiting in the balmung queue playing and enjoying the game.
Some people do get worked up about seeing "imported names" from other characters/stories/etc, so I can understand if they're getting caught up on that. But at the same time, why not let them do their things and you do your thing? I don't see many people who are really gonna try to pull out a kanji dictionary and fact-check a name. That time is way better spent waiting in the balmung queue playing and enjoying the game.