AP Style Issues

My entire life, I have been taught to use serial commas, which is the final comma in a series of words or phrases. AP Style, on the other hand, tells you to omit the serial comma unless the list is complicated or omission of the serial comma could cause confusion. AP Style also tells you not to use commas before the Jr. or Sr. or Roman numerals in names. It is going to be hard to break these habits, for I have been taught to do otherwise my entire life.