Not at all. Inflation increases asset values in most classes and if anything rich are the main beneficiary of the inflation. For example, a rich person will typically borrow $1M against his other assets to buy a condo at 3%. Inflation makes that condo $2M but you are still paying 3% on original pricing. Your networth just increased on inflation-adjusted basis.

On the other hand deflation negatively impacts rich people. Vast majority of income for many rich people is passive income. Deflation makes it miniscule while at the same time empowering poor people to aquire capital at negligible cost.