Why? Because this week I encountered no less then six people, aspiring writers all, who simply cannot take advice. It's really maddening. And I'm not talking about these people taking my advice. I'm talking about them not taking ANY advice, not from anyone. Not from an agent who replied that the work was just too long or the editor who stated that the conversation was just too trite. These aspiring writers simply refused to acknowledge that their writing was anything less than perfect. And these are people who hope to be published!
I'm not saying you have to change your story over every little bit of advice you get, but you have to be open to feedback. As a writer, or an aspiring writer, you have to keep an open mind and understand that advice can often improve your story, hone your skills, and increase the chance of your work making it past the slush pile. The advice of critics can and will make you a better writer, but only if you're willing to hear it.
If someone with experience gives you advice, you should seriously consider it. A publisher, editor, or agent is usually an expert in the field. Others writers who have been published have a good idea of what works and what doesn't. If someone you trust tells you something is just not working within the story, do yourself a favor and really look at ways of improving your book.
And, if you absolutely refuse to accept any advice whatsoever, don't whine when you keep getting those rejections slips. Instead, frame then as a testament to your stubbornness. Harsh? Maybe, but none of us are perfect. I've never written a book that hasn't changed between the first draft and the last, and I'm pretty sure other authors haven't either.
