Once in a while I receive a review that really bothers me, like over the weekend. And I had a headache which didn't help. Did I go off on the reviewer? Maybe a little bit. After I politely, and professionally thanked her for taking the time to read my book, I went on to explain, or defend myself if you want to look at it that way, some of her comments.
Here is what I wrote: Hi, thank you for reading and reviewing my book. I appreciate your comments and normally take reviews with a grain of salt, but I wanted to cover a few things.
I was surprised that I actually heard back from her. It was a long note, and she went into detail explaining what she meant by her comments. I actually felt better after reading it. I was able to understand some of the points she made, and are considering them. You're never too old to learn something new, right? And if it improves my writing, well, that's a no brainer.