Sometimes I blame Tolkien for it, because Eowyn was his favourite but he never gave a damn about Arwen. He gave her all these powerful and amazing forefathers and then she never gets to prove herself like other characters in the story; he never cared to integrate her properly into the narrative. So he loved Eowyn and Faramir was his self-insert and therefore he wanted them to be together instead of Aragorn/Eowyn? Fine by me, but he could have done something good with Arwen, starting from giving her a good characterisation. I mean, he barely wrote about her and everybody thinks she only knows to sit and sew, which leads me back to what I said about her ancerstors.
I really wish this fandom loved Arwen, it makes me sad to see so much hate :(