This type of mentality is readily observed amongst abusive parents. "That was a long time ago, why can't you move on?" "You were a sensitive child."
I will never understand people who seem to lack the ability to see that their actions may have a rippling effect throughout someone's life. One can meaningfully and negatively alter the trajectory of someone's life with one action.
I'm not advocating that we live in neurotic paralysis wrecked with the fear of unknowingly hurting others, but we should accept that whatever hurt we do inflict can have long-lasting implications, and when others shed light on ways we may have hurt them, that we lean in, understand, and make amends if possible.
We are all connected.