I've noticed I've done this. I've thought of person X who is manipulative, emotional, simple, traditional, forceful and controlling. I've thought I'm not like her, and it's meaningful to me. I do some of the things she does, but not the whole package, and I feel defined by that I'm not her.
Likewise, there are other personalities who seem to define "not me" for me.
I think there's about 6-8 such persons.
The alpha-type response for this is here: "I define myself by me, not by others!"
So now that we have that response handled, do you partly define yourself as not someone else?