Interesting question, relating.
I relate to people more based on honesty & people-view / compassion capacities than trauma vs. not, or types of trauma.
Mostly because some types of trauma are awfully common in some circles, unheard of in others, so that alone can't be my navigation of any sort. Who we are as people, not what happened to us, is more a common ground to land on, for me.
(That and sense of humor. If I can't laugh with that person even in times I have my emotions & am able to laugh, physically? We can't be pals. Everything else, yes. Pals, no.)