"Anything can be traumatic, so you can't judge what's traumatic to someone else" and "It's wrong to say that someone's trauma is 'not so bad' compared to someone else's" are well-meaning concepts that, increasingly, I'm seeing used in harmful ways that, intentionally or not, have the effect of amplifying the emphasis on milder traumas of more privileged people, and minimizing emphasis on objectively more severe traumas of more marginalized people.
We're not supposed to say that some traumatic experiences are not that bad, but the reality is that some traumatic experiences are actually, objectively not as bad as others. In fact, sometimes, when a negative experience is perceived as "traumatic" by a privileged person, the problem is not that the experience was actually traumatic; the problem is that the privileged person felt an undeserved sense of entitlement to never have their privilege challenged or be expected to respect the rights of others. "All traumas are equally valid" is becoming the "All lives matter" of psychiatrically disabled people.
I've repeatedly had exchanges like this with people who identify as members of supporters of the mad/ neurodiversity/ psych disabled communities --
"Abusive behavior is caused by trauma."
"But here is an example of person with a privileged life, loving family, supportive friends, everything he could ever want, who is nevertheless abusive."
"You can't know what's traumatic to someone else. Maybe his mother didn't breastfeed him. That could be traumatic."
"Okay, but there are people who experienced much worse forms of trauma, who are not abusive."
"You can't say that someone's trauma is not so bad compared to someone else's! All trauma matters!"
This is also perfectly compatible with the mainstream, common assumptions of mainstream American society. It's consistent with the way most mainstream writers frame racism, sexism, and other forms of bigotry as the product of "disaffected" or "disenfranchised" working-class people, ignoring their popularity with successful, powerful people. It's consistent with how all discussions of mass violence are derailed by discussions of "bullying" and "social isolation" (even when there's no evidence the perpetrators were bullied or isolated by anything other than their own choices). Or how "gay panic" and "trans panic" are considered valid defenses to murder, because a straight person's fear is more important than a queer person's life.
Ideas that were intended to validate traumatized people are being distorted into ways to prop up shoddy, bigoted theories (like "all [thing I don't like] is caused by trauma") and shield oppressive people from criticism. No. Not all traumatic experiences are equally severe. Not all traumatic experiences are equally RELEVANT. And if you experience "having to recognize that other people have rights, too" or "being treated as equal, rather than superior" as "traumatic," the problem is you.