I wouldn't worry about it. I think it's a stretch to even refer to him as a whale anymore.
I'm sure that he loves these types of posts though, so it would probably serve you better to simply ignore the flags. Eventually he will stop when he sees it's no longer effecting you. That, or within a couple of weeks his flag will be about as damaging as mine anyway, so you will have nothing at all to worry about.
That's what you think.