Casimero can do what he wants to do, it's true he is really disrespectful, but that's him, and IMO, it's not nice that Donaire back out in a suppose to be big fight between him and Casimero because he got disrespected, it looks like he was afraid of fighting Casimero that he could persecute in the ring to teach him a lesson.
Or maybe it's just another drama in this sport. It's not hard to talk behind doors since they are both Pinoy, right? Just thinking that since there' pandemic and promoters are looking for more interest from the boxing fans, with Casimero and Donaire it's only their local fans that will possibly watch and bet with them, unlike with Inoue, there are big market behind Inoue and with how Casimero engaged with the fans, the trash talks bring him to this level.
He's also a champion and for sure he has that skills and capabilities, plus he's camp (MP) developed more from his skills. This fight with Inoue is very exciting. Both fighters are aggressive in terms of throwing heavy punches and countering the attacks of their opponents.