perhaps he just didn`t pronounce the "s" in quieres; that happens sometimes. However, the correct way to say that sentence would be "que tú quieres"

Los habitantes de las regiones costeras suprimen generalmente la "s" final de las palabras cuando hablan. Es su acento, y la frase "que tu quieres" es su forma característica de ordenar las palabras. Pero la forma correcta de hacer la pregunta sería: " ¿Que quieres tu?".

I agree with Perla and I like to add that many people living outside their homeland tend to formulate the sentences using the foreign language grammar even when the sentences are in their native tongue. Probably that was the reason of this grammatical mistake. Perla´s statement is correct, the right way to ask would be: Qué quieres tú? or Qué quieres? (general question widely accepted and understood) or Qué querés? (mostly used in Central America). or Cuál querés? (if the boy wasn´t able to choose something) As in English "Cuál" may substitute "Qué" under certain circumstances (Which --> What). I hope my comment was helpful, kind regards,

Thank you both for your answers. I have never heard of "que quieres tu" only "que quieres". Many of my friends are from Mexico and Honduras so maybe "que quieres tu" is not heard that often in those regions. Thank you again! Que tengan un buen dia!

Por favor Jovany Villada, lee bien mi respuesta.