@Martin3527 Sorry you had this distressing situation. The host didn't leave any public response to your review, only posted a review of your stay. So if he sent you a private message, no, that wouldn't be in the public domain, no one else will ever see it.
I can understand that you didn't think a curtain hook on the floor was any big deal, or worth contacting the host about, but it's always a good idea to document anything anything that seems amiss when you arrive for a stay- take a photo and let the host know so you don't get blamed for it. I had a seasoned Airbnb traveler who called me up to her room 5 minutes after she checked in, to show me that the shelf in the closet was loose, as she didn't want to get blamed for it (I knew it was loose, but had just forgotten to tighten the screws).
Even if she hadn't done that and I thought she had caused the damage, I wouldn't have charged a guest for something so trivial, and personally I think the host was being rather petty to charge you for such a small thing, even if you had been responsible. It isn't normal wear and tear, but small damages do happen and most hosts just have a fund to cover those and don't bother charging a guest, as long as the guest was otherwise good ad left the place in decent shape.
But I did look at the reviews the host has left for some of his other guests, and I can't see that he has any history of accusing other guests of causing damage, so no one but you and he know the real story.
Aside from saying you caused damage that you denied, his review of you is positive, so I wouldn't worry about it too much. Your response to his review, however, doesn't do you any favors, as it's far too long and sounds like "I think thou protest too much". A simple "The curtain hook the host accused us of pulling out of the wall was lying on the floor when we checked in. I didn't think anything of it, set it on the window sill and never considered it worth reporting to the host. I'll know better next time if I find something amiss on arrival, and take photos."
As far as your review of your stay, you have no reason to regret it. A review is meant to be an honest report of your experience before and during the stay, which yours was. If a guest is a good one, and leaves the place tidy and communicated well and the host leaves a good review, just because that guest might leave a bad review of the place, doesn't mean the host has a reason to change their review. Reviews aren't meant to be tit for tat, they are just meant to be honest reports of the host's or guest's experience. Which may not be mutually appreciative.
If it's any consolation, guests get refunded quite often when contacting Airbnb to report something wrong with the listing, even if the guest doesn't provide proof and is lying, without Airbnb hearing the host's side. You could be persistent in trying to get what you were charged reversed, but Airbnb is so hard to contact these days, it doesn't seem worth your while.