Black Maria was being a bitch
Sasaki attacked his own crew
Who's Who was a racist
Kaido never did anything personal to Luffy
Trying to execute Momo, almost blowing half of Luffy's crew to oblivion, etc is not enough I guess.
Luffy got pissed at Crocodile why? During Whiskey Peak he was actually excited to fight him and all.
But after he saw his friend, Vivi, desperate, he just got hella mad and wanted to beat the shit out of Croc. No buddy buddy.
Same for Arlong making Nami cry.
Same for Krieg trying to destroy the Baratie.
Same for Buggy trashing the dog's shop.
etc.
This "buddy buddy" moment could have made sense with someone like Shanks, considering he actually IS Luffy's friend.
Luffy has 0 build up to be having this "casual sparring" with Kaido. It should be a fucking serious fight like the one against Lucci.