I think the cabbie is crazy to get mad at someone who pulled out in front of him,its Honolulu, you can/have to pull out in front of anyone, as long as you shoot them a shaka or at least wave while you mouth THANK YOU.
If it was me, I would have slowed down and let him in. I let everyone in in traffic, at least during non rush hour like this was. In rush hour, I let in one, and so does everyone else, so the merging is orderly and smooth.