what difference does it make

Inflation: The input costs of creating something is higher beyond their control. It's true that this did increase a bit.

Greed: Companies decided that because they have less supply, they'll raise the prices of the inventory they have, but this was a conscious, deliberate decision. Since there's less overall supply, it's difficult for customers to go elsewhere. Once supply replenishes, the available supply will eventually satisfy the demand and in order to continue moving enough product to meet their sales targets, companies will need to lower prices.

it's still a fast 20% in one year.

I'm not denying that, but (and I admit this was a bit before my time) in the 1970s - 1980s, and even for the early '90s, inflation was significantly higher than it was today. Genuine question, what did people do back then? I know banks paid higher interest rates for cash held in accounts than they do today, but I know that time period was seen with rose colored glasses by some of the older folks in my family.

I can tell you my grocery bill has nearly doubled Rents in my area have increased maybe 15%

I feel you on that, and I truly hope that things work themselves out sooner than later.

Rent is always going to be tricky since it's generally loosely tied to the value of homes nearby in the area. Since many cities have seen a lot of influx of people moving in but building new housing projects always lags demand. Increasing rent is going to be one of those "Because we can" scenarios by landlords or property management companies.