Where did it say that? ...I actually, I've been kinda speculating on that... Here's a theory of mine...
Ever wonder WHY Waluigi hates Luigi so much? ...Could it possibly be over Daisy...? Every recent game that she's appeared in, he has also. If the rumors are true about Luigi and Daisy, then perhaps Waluigi has an obsession with her and is trying to win her affection, and competing with Luigi for her, although he'd never admit it...
Creepy if all my theories perhaps are true...
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If things don''t go your way, just keep complaining until your dreams come true.