Pink and yellow is, by far, Oda's favourite combination of colors (and orange his favourite color overall), so those who can't stand Enma being pink (not even that, it's more like a violet hue) should reconsider the chromatic criteria you're applying to One Piece because there is a clear incongruity. You can have some artistic disagreements with the author (I don't like Whitebeard and Roger's color schemes in the cover, for example), but that is different from despising a choice basing on reasons like it isn't manly enough for Zoro.