Is it un-American to buy a Toyota?

No, why would it be? Every person has their own preference when it comes to cars. If the Toyota is the best car for the person buying it, then why shouldn't they get it.

Do not listen to the masses of people saying "Buy American! Support OUR economy!" because they fail to understand that there are equally as many manufacturing locations for foreign cars in America as there are for "American" cars.

A Toyota is probably made or assembled in a factory in America, employing Americans and contributing to the local economy.