I went from being fully mobile to paraplegic in the space of 24 hours. For a while I was in a real woe is me phase, I couldn't read anything that was about disabilities/disabled people. That is my issue and I own it. I certainly wouldn't expect to be mollycoddled by a book seller. And where do you draw the line? I was dive bombed by a seagull for my chips on Bournemouth beach when I was 8, we are now well over 30 years later and I remember it clearly. Can we please get a seagull trigger warning?
I think people need to take personal responsibility and if you are triggered by xyz there are a lot of self help strategies that you can have in the background to help you through a tricky situation, paced breathing, 5, 4, 3, 2, 1, 5 minute feelings and so on.
Being triggered is horrible, but equally we are all unique with our own set of triggers. Just for Tattlers alone Waterstones have written 16 postcards for one book.