How safe are non-system spaces on here? (More below)

Genuinely asking. On a scale from 0 to 10, how safe are certain spaces? Even on this app and in other fandom?
I wanted to post on AITA about me and another mate because I disagreed with him, but apparently I heard that it wasn’t safe at all.

Speaking of AITA, I was going to ask a question on NoStupidQuestions, but after I got called a weirdo for commenting about our situation under a DID-related post, I felt it wasn’t safe to ask. I had wanted to ask more questions, but I don’t think I will anymore.

On a related topic:
Also why do so many people still not believe that DID or any other multiplicity is real? I don’t understand, and that is one of the things that I had never understood at all ever since I was young because I knew that DID was real.
How do these people not get it? It drives me mad. No, it drives me crazy.

Okay, I know I can’t change how some people feel, but I can’t change how I feel about that. That’s a fact, and it will forever grind my gears about how there are people that don’t accept anything even if it’s easy to understand.