Perhaps turning on a fan and clearing the air around you would help. I never implied that Jamaicans were "fake". I hearken back to the '60s in California when everyone wanted to look and act like a hippie (for the free love I think!) A real "hippie" (just like a real Jamaican) can spot a poser from all the way down the street.
Knowing the latest thumb-rubbing handshake won't get a tourist mistaken for a Jamaican. Again, be yourself and the vibe you send out will dictate how you are treated. When you meet a Jamaican that you want to be good friends with, he or she will teach you what is the newest fad and not the other way around.
My point at the beginning is that being "real" and "genuine" in how you approach Jamaicans is more important than being a Phd in Jamaican Culture with a degree from the Internet majoring in DIY Travel Expert 101.