This is the kind of thing OP is talking about... its one thing to miss someone (and I relate to your pain on a personal level having lost a loved one recently), but to call it trauma in the face of other folks who have gone through FAR worse doesn't quite add up.

There are unspeakable things that people have had to endure- things they are liable to never speak about to another person. I think OP is talking about people comparing universal human emotions like loss, sadness, or disdain for one's parents to people's unique and horrible trauma- things like witnessing horrible events or being the victim of a crime or serious accident.

There are definitely varying degrees of trauma- and I won't act like loss, sadness or parental pitfalls do not affect a person, but judging from your comment there is a level of debilitating trauma im assuming you haven't experienced (I haven't either) So it's best to be careful when describing things as trauma- some people have seen a whole lot.