I "see" (inside my head) the scenes play out in perfect detail When I flashback to my greatgrandmother(as I mentioned in previous posts) it's just her face I see. I'm terrified of the PEOPLE not necessarily the genre of the television shows and movies.
I too am not doubting your ptsd and think most of the posts on this thread aren't either. There are few things that I think may be interfering with you being heard on here.
The one is listing or discussing your phobia symptoms. Phobias are very different to PTSD. You have been diagnosed with both but for this discussion it would aid you to leave out the phobia stuff. Phobias are often started off by something deeply upsetting in childhood but other times something separate that is upsetting gets attached to the object of the phobia. Phobias can be about anything at all and don't have to be about something that is deeply terrifying, horrifying or violating. Phobias usually cause panic attacks, fear, avoidance ANS reactions. But phobias wouldn't have flashbacks as a symptom and they are totally different to trauma or PTSD.
The other thing I think that is impeding you being heard is that you haven't actually said what you felt when you watched what you flashback to and why you found it upsetting or what the general content of it is/was. I understand that could be upsetting for you to discuss. I understand you are saying you don't flashback to abuse scenes. I hate to say this as it is suggestive but I would also wonder why you see your grandmothers face. I know you see it as secondary to the film but I do wonder. We don't always remember everything.
Lastly I do think it is possible that your mind has somehow got its wires crossed and that your flashbacks are about your abuse. You say it doesn't upset you to discuss your abuse but I have been there in the past and
refused to accept that things had affected me and no matter how much therapists insisted.
You say your mother had the attitude that if you are afraid that you face what makes you afraid and do not run away. I wonder if in your childs mind you could have linked that need and those thoughts to other parts of your life and your feelings and that that could have deeply affected you and the films became the link or the dumping ground for all the rest. Sometimes judgements like this (your mothers) make trauma worse in my opinion.
So my advice would be to stop discussing anything related to your phobias if you continue your discussion here and explain what it was that was
traumatic in the true sense as PTSD is about horror, terror, being personally invaded and extreme helplessness.
Regardless I wish you healing and strongly recommend you discuss the abuse with a trauma therapist if you are not doing so already. Denial is bizarrely powerful and deviously clever thing.