"typical Mexican rip off"

Correct me if I misunderstood. The car rental had a charge of $xx USD which they converted to pesos at a rate that is very favourable to them and then the rental company had the customer sign a charge slip for the amount that the rental company computed. I can’t see how the card company can help when the amount on the slip is for the total that the customer agreed to.
I’m not blaming the customer in any way and I hope I’m wrong but it just seems like another typical Mexican rip off. A family member was discussing how, after spending three months in Puerto Escondido, the most important thing he learned was to make sure to count his change every time he was handed change. “ oh, sorry, my mistake”. It is amazing that a country with so much to offer is so corrupt.

Maybe I'm just The Luckiest Gringo in Mexico, but I have never been shortchanged by any Mexican in over 30 years here. And I have no idea what distinguishes a Mexican ripoff from a ripoff in Canada or the USA or anywhere else. People point to Mexico as being corrupt with such ease while ignoring much worse corruption under their own noses. Lobbyists. PACS. Super-PACS, Citizens United. These are what the rest of the world considers practices of blatant corruption. Most tourists in Mexico will never encounter corruption, and being shortchanged or getting a bad exchange rate simply doesn't qualify.

While I can certainly sympathize with the person who rented the car and got charged for a bad tire under questionable circumstances, I also sympathize with the rental car worker who is just following the company's policies to do their job.