Earlier quoted context omitted.
Just to be clear. The person did not say it his personal inflation is 100%. He said prices increased by 100-150%. If item X usually costs $3 and now it costs $6. The price of that item increased by 100%. Perhaps he is only spending 10% of his income, but it doesn't really matter for what he is talking about.
He said the things he care about doubled in price. This is a remarkable claim. Even gas appears to have only gone up around 30% year over year: https://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=pet&s=e...
I would say that you can't just look at average prices for the US. Look at the California version of that chart [1].
July 2021 to July 2022 is an increase of about 38%.
If you look at June to June it is 50%.
While not double, it is quite a bit more than 30%. Depending on the area the person quite possibly did recently experience double the price like I did.
[1] https://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=E...