The problem I see with this gag in particular is that it reaches Law and Kid too, and even for Luffy, who has been a clown in many fights, it feels a bit forced and very little idiosyncratic. Regarding my first point, Law is edgy and pretentious, too serious for that reaction, and Kid is a virtual sociopath. I don't really see them making that face out of the blue, and it doesn't help to make it more organic how we all know they are reacting like that because of a Wano running gag that only makes sense from outside the story.