Seriously, what evidence do you have to support that this happens to most cyclists? I'll give you that it's somewhat common and I don't believe it's anything to be ashamed about, but why do you feel that you need to project that it happens to everyone, nearly everyone (99% as you said), or most people. Do you have to feel that it happens to nearly everyone to be ok with having fallen?
So I repeat, I don't understand what is so difficult about unclipping when you start to fall over.
Edit: From what I've read of this happening, it seems that it may be somewhat linked to the type of pedal used, which is why I asked.
I have done this, and yes, it's nothing of which to be ashamed. Also, I've shared my story of falling while trying to clip out, and every cyclist I know has said it's happened to them. It was on a large group ride of about 30 riders when I shared the story, so we took a poll and everyone who rode clipless had crashed at least once (some twice) when learning how to unclip.
There's my evidence, and I think you're being a little weird about challenging a guy who made a pretty innocuous statement. "Most" is not "all", and I have no idea why your knickers are in such a twist about this.
So add me to your 'hate' post next time.