While everyone else is petrified and doesn't say a word, El continues to rage like a dangerous madwoman. They've never seen him talk so much, but what bothers him is the fact that he can't give Maryse back her own coin.
Although she is the mother of the twins, that would not have prevented him from making her understand she should never rub shoulders with him and his friend.
He feels outraged by the act of this woman, who, they say, embodies a kind of perfect model for others. And here she is, losing her composure and control in a childish quarrel between kids. She didn't even try to understand before acting like a fool, an illiterate, a nobody.
"If your money makes you think you're superior and above others, know that today that doesn't define someone, but I think you already know that because you're way too old to let me teach you this lesson."