It's not a common misconception. If you have a fixed rate loan, say a home loan locked in at 3% or 4% (like many current homeowners), then inflation above normal helps you. When your loan was created, a sub 2% inflation rate was priced in. Anything higher than that means you are winning and your lender is losing.
Your advantage is that you can choose to refinance when rates are low, or keep a good interest rate when rates are high. Also, I don't know what inflation hedges you are talking about that "rich people" have access to. Anyone can buy stocks, real estate, or inflation protected bonds.