You both agree, he just isn't smart enough to comprehend that his table of inflation rates supports everything you posted. I bought my 1968 Ford Fairlane brand new for $2400, but I was also only earning $1.68/hour at the time. Gasoline was also only $0.25/gallon, as was a pack of cigarettes. My parents had just bought a new 4-bedroom home in 1968 for $12,500 in Fremont, Nebraska.
As a result of a glut of US dollars in Europe, due to the Marshall Plan in the 1960s, the value of the dollar began dropping. That is when Nixon took the US off the Silver Standard in 1969. Combine that with the out of control congressional spending on LBJ's "War on Poverty" and "Great Society" and it was the perfect formula for run-away inflation. Then OPEC formed in 1973 and there was an oil embargo, which exacerbated everything. By 1980 the interest rate on a long-term 30-year mortgage had reached 18%, and gasoline prices had quadrupled.
Prices have indeed increased by more than ten fold since the 1960s, and it is directly the result of excessive, and often unconstitutional, government spending.