PTSD is a continuum and is not something that is clearly defined. The trouble that people get in is when they try to compare or apply hierarchy to trauma; eg: x > y where x, y are traumatic experiences. The whole activity seems rather pointless unless you're somehow trying to figure out what to treat first. That line of thought is fair when dealing with one individual with multiple traumas but when applied to a broader group it incentivizes downplaying and dehumanization. We used to do this a lot in the veteran community but I think folks have gravitated away from it.