I also agree that in Japanese culture they are more on respecting their opponents and if this is just a strategy from Casimero for sure it won't work as Inoue is more focus, we've seen him fighting and he's not the type of fighter that can easily provoke, he knows how to calculate and observe the capabilities of his opponents before he take his actions.
If you look back from how he beats Donaire, everything was calmly executed. He knows that his opponent is more mature and experienced than him; he waited for the right time and chooses to use his advantage.
Casimero succeed in engaging Inoue, but everything will be concluded after the fight.
This is the reason why it is interesting to see this fight to happen. Hopefully, before this year ends. With Casimero's "attitude", we will see if he has something to show inside the ring when he faces Inoue. As I've read in some posts here, Casimero is a different guy outside the ring, so maybe, he has this trash talking strategy to sell his fight but he is indeed a good person outside the ring.