From Lit World Interviews:
You will get bad reviews. It’s inevitable, I promise you. Take comfort in the fact that it’s a rite of passage all writers go through. Every – single – one of them, and after the first one has you on the floor, bawling your eyes out, and inexplicably trying to chew your own foot off for a while, they’re not so hard to deal with. Some are pretty funny, and some are just to be ignored. There are people out there who delight in trashing books, and sometimes the authors of books too, for reasons unknown to most decent humans. Sometimes it’s jealousy, and sometimes it’s just because they’re mean. Sometimes also these one star stabs to the soul are perfectly legitimate in their author’s hearts and minds, because they really didn’t enjoy what you wrote for reasons that do or don’t make sense to you. Whatever the reasons are for your one star clanger, you must never, ever, never, never, and I repeat, never respond to them. If you really need to share your pain then talk to a friend – preferably a writer friend, who will totally get you. I personally don’t think that it’s a good idea to respond to fabulous five star rave reviews either. “Liking” that wonderful review is good enough. The reviewer might actually not appreciate being gushed at by an unknown author, no matter how much you really want to catch a plane, find them, and kiss them on the lips. Reviews are for readers, good ones and bad ones. It’s best for you to let them be.
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When you do get a negative review, pass it on to that part of you who is the business – not the writer – figure out if there is anything to learn from it, in which case it becomes helpful, and if not, move right along and forget about it. Don’t waste your valuable online time on trolls and hurtful reviews.
Link to the rest at Lit World Interviews