Keenan Shaw was suspended for two days by Winston Churchill high school for selling the soft drink to students, violating a school policy that only permits diet pop on the premises.
Shaw says he was told the sales violated the nutrition and marketing policies, and that he was operating a business without a licence.
But compared with what some other students sell at the southern Alberta school, Shaw says, his transgressions were minor.
"I'm not going to name any names, but I know a couple of people selling marijuana, there's kids selling smokes, there was a kid last year selling meth, as well as a kid selling acid," said Shaw.
Shaw says he has been told he will be expelled if the pop sales continue.
His mother says she believes the school went a little over the top and that the punishment is too extreme.