If you own a disproportionate amount of INflationary currency, you are, you know, still a rich person who can afford investments, investment consultants, tax optimization experts, have preferential treatment from banks and personal relations with the government employees, so you're good anyway.
Whereas if you're poor, you don't even have a chance to save enough to invest a little bit, because whatever you save today becomes useless paper tomorrow, so you're forced to spend, thus enriching service and goods providers, that is the rich.
In a deflationary currency you actually have a chance to save some money for an investment, plan for tomorrow, or even next year, and not spend everything today while money still have today's value.
A deflationary currency that you own a disproportionate amount of is great. For you.