I feel like Whitney's tantrum is more iconic, mostly because it happens first, so it made more sense to turn her into a brat
Clair probably would have done the same if she challanged the MC to a battle and lost (after Mewtwo wrecked all her Dragons), but she was too busy getting annoyed at Morty to bother
Also, it just occured to me that Gen 2 is the only one where the Gym Leaders refuse to hand over the badge, and they do it twice!