There are many people for whom the adoption experience has been terribly traumatic. It's important to recognize this truth. I still agree with Jim Gritter's notion that pain is at the heart of every adoption decision. It is possible that there are some who have been so traumatized by the pain of adoption that P.T.S.D. is a viable diagnosis.
Unfortunately I think the trend for self diagnosis has diminished the likelihood that these genuine cases are taken seriously. But this isn't the case for P.T.S.D. alone. Self diagnosed depression, A.D.H.D., bipolar, even sociopathy diminishes the gravity of the reality these diagnosise carry. This is especially the case when the claimed mental health condition is used inappropriately to justify otherwise unacceptable behavior. The didactic tale of the boy who cried wolf applies, very tidily, here.
Here I step onto my soapbox.
Mental health difficulties are serious conditions. They deserve to be taken seriously. Just as a person who claims to be diabetic eating a cake, I can't take seriously a person who claims P.T.S.D. that isn't in ongoing therapy. If one takes mental health seriously it isn't a justification for poor behavior. On the contrary it holds that person to a higher degree of accountability. To claim to have P.T.S.D., whether diagnosed by a professional or not, means taking ownership of that experience and the responsibility for recognizing it. If one accepts a diagnosis there is an implicit acceptance of responsibility for taking every reasonable step to ensure the condition in question doesn't unduly effect others.
If I am depressed I am responsible for taking steps to mitigate how that effects my other relationships. That doesn't mean keeping it a secret so no one feels poorly for me. Instead it means finding the help I need to establish coping strategies so my depression cannot get out of control and begin damaging others. Similarly if I suffer from P.T.S.D. I must also accept the responsibility of taking every step possible to normalize my relationships and interactions with others.
So what's the point of all this? Well, the short nasty version is if you have P.T.S.D. and know it you don't get to take it out on other people. No matter who the person is, what s/he thinks, says, or does. Acknowledging trauma prohibits one lashing out from that trauma. To say otherwise is to spit in the eye of every person who has ever struggled with any mental health disorder.