I'm so sorry you had this experience, hixidom. And my heart goes out to everyone in this thread that has gone through similar treatment. I've experienced gas lighting, huge invasions of privacy and inappropriate sexual advances in a community of psychedelic users. Just sharing my own story to help affirm that you are not alone in this.
I witnessed one manipulator abuse people psychologically, and then use their position + the fact that psychedelics were involved to suggest that the abused individuals were losing their minds. It happened to a handful of people one after the other, and when I spoke up about it, they used the same techniques on me.
You showed an incredible strength by not attempting to correct their story, and by stepping away. I would say that its almost certain that they were and are consciously lying. Some people enjoy the hit of manipulating even after the traumas. The more reasonable of the individuals won't admit it, even though its staring them in the face. There are just too many legal and personal reasons why they would never be able to express the truth.
When my memories of similar events rise up, I ask the same exact question... "Is the average person this evil?" Honestly, I believe that many of them have this potential, although not everyone intends to do it. Especially in a situation where a primary abuser is coercing them. Now, I know that I have used these experiences to learn how to protect myself, observe warning signs, and steer clear of those who show this potential in subtle or obvious ways.
I tried to respond to your questions without offering ways to fix it. If you feel I overstepped that, feel free to disregard my message or let me know outright.
Best wishes to you. And thank you for sharing this, even though I'm sure it wasn't easy. It helps raise awareness for others and helps people like myself to continue healing.