If you don’t ship a pairing, don’t read fics about it. Don’t leave a comment if you’re only going to send hate to the author for shipping a pairing you personally do not ship. Please, just don’t.
Fanfiction authors are not there to fulfill your every whim. They have their own opinions, their own ships, their own comfort zones. Getting hate for something that makes you happy – something that made you open up a Word document, spend days agonizing over words and emotions and the characterization of two people you hold dear, edit in the middle of the night with weary eyes and your bed calling your name and the thought of people reading your fic and liking it, and find enough courage to post it – is only terribly discouraging. If someone writes about something as pure as love, you have no right to step all over it. Your comment could very well be what squashes a writer’s creativity, what causes them to put away their fanfiction writing pen forever, and then the world has lost a brilliant artist.
Just like fan artists hate seeing tags such as “i really hate this ship but the art is so good,” there is nothing worse than reading a comment like “your writing is good but i hate this ship and you should write for x ship instead” – or something even less polite. If it means that much to you, try writing a fic yourself. Just don’t send hate.
Please, be kind to fanfiction writers, and please respect a writer’s ships.