Possibly because we're discussing Genji's trauma in the context of his possible romance with Mercy, which at least in commin fandom portrayal uses particular tropes that are very gendered. Like I dare you to find me one gender reversed instance of the same narrative of romance as caring and validation of humanity and worth. Genji's a sweetheart and his story is interesting, but in the context of the ship it plays into annoying gendered clichés.