No it kinda isn't. He was always like this. Reread that again, he didn't stay quite monk boi just yaps. And that is totally in character for him.This is really out of character for Ken to just straight up refuse without judging the situation first...
He stayed quiet and then refused just to create a villain from his time line cuz the author demand it not how Ken the character shouldve acted...
Hope this wont turn into some weird drama ...