SweetLeafSamadhi said:

Out of the judgement OP is going to face for being a white guy with dreadlocks, faking a Rasta greeting around people who already presume him to be a Rasta is relatively low on the list.  If he feels most comfortable giving blessings, then that is really about as good as anything else.

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I'm just most comfortable returning the semi-formal greeting of Rastas in a way that they find familiar and polite. Probably a simple "Jah Bless!," a nod, and a smile. Much easier than stopping to explain in detail to strangers that I'm not really a Rastafarian.

I'm certainly not interested in trying to effect a fake accent, now THAT'S racist.

Thanks for all the advice in this thread guys, let's try and keep this discussion positive and uplifting, friends.