Agree w/ Cara on the trauma definition. Some people have incredibly poor coping skills. Someone who has a meltdown because they got a "B" on an exam had their resources overwhelmed but did not experience trauma.
I fully support there being some room for scientific debate around the exact boundary definitions of trauma - there is certainly a continuum of "unpleasant things" and I haven't seen good research suggesting fundamental breakpoints based on DSM definitions. That said, this is a nuanced scientific debate and not what is taking place in public forums.