MIEventer has -always- posted helpful, insightful, and kind critiques, with thorough explanations. Perhaps that's why we look to her so often, eh?
I don't feel that she was disrespectful to you in any way, Trissacar. She didn't aim her comment in your direction, and you are not the only one who instructed the OP to arch her back.
MIEventer has posted her opinion in a respectful way. Just because it isn't the same as yours or others, it doesn't mean it's a personal attack.
You state in your last post that you do not have time to give a thorough critique to everyone, because you are busy. That's great that you have wonderful horses to ride, and that the majority of your time is spent there. MIEventer seems to enjoy providing thorough critiques to those who want them - don't jump down her throat for it.