You are right...Body language isn't always right. Arms folded on the chest could indicate the person is cold for instance, rather than the person being closed off. It is situational. That's why I suggest some research on the topic and how body language can assist one to communicate more effectively.
I have found body language, and communications between humans, fascinating and so I'm passionate about the topic. I have much to report to my superiors when I return to my home planet. :)
Thanks for commenting.