This runs totally counter to reality.
The rich have a lot of monetary assets. For example, money in the bank, investment vehicles, etc etc. Their wealth goes down *faster* than the majority of people. Unless they leave the country, of course.
The poor have less monetary wealth - indeed, most of their monetary stuff are *debts*. For example, mortgages. Under inflation, the amount you owe under your mortgage stays fixed nominally, while the price of your house increases. Thus you are better off. Under inflation, your wages will also rise to compensate for the rise in the cost of living. Hence, if you aren't living off of interest, you are relatively unaffected by the pain.
Historically, the poor have always clamoured for inflationary policy, while the rich have always pushed for deflation, for this exact reason. See the debates over free silver, leaving the gold standard, etc. This is textbook stuff.