The traits the word "childish" addresses are seen so often in adults, that we should abolish this age-discriminatory word, when it comes to criticizing behavior associated with irresponsibility and irrational thinking.
Los rasgos a los que hace referencia la palabra "infantil" son tan frecuentes en adultos que deberíamos eliminar esta palabra discriminatoria a la hora de criticar comportamientos asociados con la irresponsabilidad y la irracionalidad.