Which is even more hilarious, since it doesn't make any sense at all.
WB started an entire fucking war with the marines to get back Ace and even called all of his allied friends to help him.
Here his sworn brother Oden's country is in grave danger, his crewmates even try to convince him to go to Wano and it would "only" be one Yonkou crew they would have to defeat.
He didn't even bother asking about where Oden is.
Then Ace tells him what happened and that all their friends in Wano are oppressed, killed and in great danger, since Oden is dead.
Yet instead of avenging is sworn brother Oden, somehow WB is like: "Naaaaah, not interested fam."
It's so, so bad, it's hilarious. It would've been better if Oda didn't try to explain it at all. Now he just tried to insult the intelligence of all his readers with such poor excuses.