I believe you are in fact entitled to your opinion however when your opinion is virulent and hurtful you should be mindful of the fact that you may upset others. "Not believing" someone especially about important "dirty laundry" as you so eloquently put it seems like an extremely personal opinion and not at all warranted outside the confines of your mind.

Perhaps you did not in fact say she was not entitled to her opinion but your brash belittling of her opinion seems to speak that you do not hold it in high regard, perhaps so much so that it might not be such a logical leap to say you'd prefer she not had one at all.

Then again all of this is my opinion. Perhaps we should agree to disagree.