Agreed that the title is wrong. Is there a word for not just playing down someone else's success, but denigrating it? E.g., "My rival at work just won the lot

Agreed that the title is wrong. Is there a word for not just playing down someone else's success, but denigrating it? E.g., "My rival at work just won the lottery. Sucks for him, doesn't he know that most lottery winners end up broke and unhappy?"