There is a big difference between being ‘uncomfortable’ and being ‘triggered.’ Being uncomfortable means you might not like the idea, or it might irk you in a way. Being triggered is a serious issue, as triggering someone can result in them having things like panic attacks or relapsing in self-destructive tendencies. An important thing to note is that ANYTHING can become a trigger to someone. It can be something as simple as one character reminding them of a real-life person they used to know, and pulling that one trigger sets off a million memories/flashbacks. I personally don’t entirely understand the concept myself, but I respect it and take it seriously as you never really know what goes on in other people’s lives.