That you know what happened to me and what triggers me. You don't. You have some idea, and that's partly right. But I get triggered a lot - this week alone three times by male genitals (someone drew one on the window in my classroom - well, I get triggered by that every time I'm in that classroom because no one has removed it -, a classmate thought it was funny to send a link to a picture of a naked man to the whole class (on the year group what's app group) with the message it would give information on which teachers wouldn't come in because of the snow, and when sharing pictures of snowmen on our family's what's app group, my cousin sent a picture of two snowmen "doing the deed") - and people probably wouldn't do that if they knew what triggers me, what happened to me, stuff like that. (At least I hope they wouldn't.) But people just assume "No one told me they've been s.assaulted, so no one I know has been s.assaulted, so I can send crude pictures and no one will get triggered". I wish people would be more careful in that area. Don't send pictures like that unless you know the person receiving it will be OK with it.

Or the people assuming my PTSD is because of my leg amputation, or sometimes the illness preceding it. Uh, not quite. My PTSD is mainly because of the medical torture that resulted in my leg needing amputation - the amputation itself wasn't actually traumatizing. And to a lesser degree, because of the s.assault and some other stuff. But mainly the torture.
When people assume PTSD is because of my leg amputation, it's kinda hurtful, because it feels like they're discounting that something REALLY AWFUL has happened (or, for those who don't know, might have happened). Or one of my teachers at school (I receive assistance and stuff from a special eduaction school that has an office at the adult education school, while following my classes at said adult education school - she's the teacher that mainly provides my SpecEd assistance) sent the rest of the teachers a short email saying I have PTSD (we discussed she'd do that, the fact that she emailed wasn't the issue) because of a nasty medical history or medical treatment. That's like saying I have PTSD from a tooth extraction. A tooth extraction might not be fun, but it's not abusive. It's "for the greater good" - it has a purpose. I have PTSD because of mindless violence. No purpose, just pain.
Any time someone says it's because of a treatment, I feel.. well, I don't know how I feel, but I don't feel heard.

Then there's some annoyances, such as people being too careful (people who know I don't like being touched in certain situations, or assume I can't stand being touched at all) and as a result won't come within 10 feet of me (OK, that's a bit of an exaggaration, but I trust you get my point).
On the other hand, my parents aren't careful enough - they know I have PTSD and tell everyone (even those who don't need telling because it's none of their business) about how they have to be careful in some areas, but they themselves never are.
Definitely one thing I hate the most - but that's mostly what I hate about my parents, not a wrong idea that I'd like to eliminate.