you're not wrong. You know what's right for you, what will or won't work for you, and what you're willing and able to do in order to have better health. That's what I chose to tell anyone who questioned my sanity while on my 22 day cleanse.
They certainly couldn't argue with the visible results they saw in my face, my body, my eating habits, my spirit from doing the cleanse.
You needn't "defend" your decisions to anyone. Kudos to you for giving up on that line of action and suggesting they read the text. I'm sure they will, and get back to you with their thoughts. (not) ;)