yes, there are many intensities of PTSD. that doesn't make any level of PTSD invalid. no, it doesn't have to be something stereotypically traumatic.
PTSD can shape the way you work in incredibly hard ways, especially when you have many layers of PTSD (called Complex PTSD)
I've experienced personally A Lot of various types of PTSD (including the military related sort!!!) and all of them are valid. Don't be a jerk.