but I got the impression that the Fijians do not judge people by how much money they give or do not.
Yeah. We all are different and in any case we are customer / tourist. Even for the most awfull customer you have to treat him with respect and with the same quality. Or change job. Change business far aware to customers or even people specially when you met different culture.
Im not on computer I can't quote. But Scuba K7 according to your profile you are instructor. Show some love bro' your 'that diver' is kinda bad judging...