What is ironic about John-John's comments to Maleeka in the beginning of chapter 28 of The Skin I'm In?

In the beginning of Chapter 28 of The Skin I'm In by Sharon G. Flake, John-John is seemingly waiting for Maleeka on the sidewalk as she goes to Sam's store at her mother's urging.
Maleeka suggests that many people—John-John included—are happier when she is suffering. John-John demonstrates that he is, in fact, happy to see Maleeka unhappy by immediately taunting her about telling on her friends Charlese and Raina after Maleeka was caught trashing and setting fire to Miss Saunders's classroom.
His most ironic comment comes when he says: "Squealing on your friends ain't even cool." He suggests that Maleeka told on her two friends rather than take all the blame. Maleeka, of course, protests, saying she never would have told on them.
Moments later, as Maleeka and John-John round a corner, a group of older boys crowd around the pair. The boys announce that they are after John-John because they say it is his fault that they were recently caught shoplifting.
Therefore, John-John's comments to Maleeka are ironic because he criticizes Maleeka for a behavior that he actually committed—even though Maleeka did not.