In DanMachi Sword Oratoria anime, Ep. 5 and 6, a woman with red hair called Aiz "Aria". For some reason this makes Aiz upset. Do we know why Aiz got upset being called Aria?
As I don't have enough reputation just yet to comment however I'd like to point out a few things. These are solely speculations based on the manga and anime as no definitive answer is not yet known
Ais is Aria's daughter however spirits are not capable of having offspring in the series. Hence the method of Ais's Birth is Unexplained and it could be something which hurts her.
People often confuse the two as they are totally identical in appearance so much that even Revis got confused.
There is a theory going around which suggests that Ais maybe Aria's reincarnation however it was countered on this archived subreddit- https://www.reddit.com/r/DanMachi/comments/6wj7ta/theory_aiz_and_bells_true_colors/?utm_source=ui&utm_medium=amp&utm_name=amp_revamp&utm_term=nh&utm_content=post_body