One of the basic tenets of body language is that we all learn to act early so we can fit into society. The things that happen less cognitively (hair touching, chest leading) tend to be "honest". The things that are more cognitive (arm slapping [possible fork swinging "get out of my kitchen so I can get this dinner made and we can get on to more fun stuff"]) are often reversed 'cuz all the world is a stage. In any case context is important. And if somebody switches body language on you believe what they did initially in context.
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Thank you for commenting, much appreciated.