Yeah...it means that they don't want to be approached/bothered. Nothing against you personally, but there could be a lot of different reasons for this, mainly involving personal issues in THEIR lives.
THIS!
Think about times in your life when you have felt the same way.
Think about why you did it and if it was anything to do with the other person or to do with you.
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Regarding the other point - mirroring.. it is a subconscious mirroring yes.. They are not doing it consciously, it just happens. You could say you are leading them with your vibe and they naturally follow it.
If they are in the state above they will resist, as shown above.
I do not advocate trying to batter through this resistance, if they want to shut you and others out, let them, there is usually a reason which is nothing to do with you. If you remove your ego from the equation you will see this.
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Scarf - if a woman waves at me, I cannot help but approach her, there is not much more open an invitation than that
Well said.