For what is worth, my personal anecdote is different: my rent went slightly down (renewed in August, in Boston) and my grocery bill has not moved in a noticeable way (middle class vegetarian with Mediterranean tastes).
Also keep in mind that groceries, or rather food in general, only comprise in the neighborhood of 10% of the average household budget. So if we're just talking about food, if you're paying 50% more, that is just a 5% increase in your overall expenses.
And as far as your rent going up by 30%, that's offset by some people whose rent actually went down by a lot during the early pandemic when people were fleeing the cities and bargains were to be had. And some people who don't pay rent at all, but pay fixed-rate mortgages which will go up by zero percent over the life of the loan. So you can see how that could significantly nerf the total inflation affecting that household.
I live in Switzerland and a few cents seems accurate. A lot of the current increase I see is based on the bad summer harvest tho and less external factors.
Either it's a Swiss thing, or because we buy the majority of food semi-directly of organic farmers and prices haven't changed that much in this sector.