>>1518670you're right, I suppose it is fine.. but in my opinion, passing on the right is okay when you aren't drastically faster than objects on the left. He was doing a bit over 30, passing traffic that was at a standstill. The cyclist wasn't obviously in the right lane, so he isn't completely innocent, but I would say a motorcyclist should drive more defensively, especially around right hooks.
And I should say, you were right that he probably wasn't speeding.