They only learn to be frightened of those differences when an adult influences them to behave that way, and maybe censors that natural curiosity, or you know, reins in the question-asking in the hopes of them being polite little kids.
Só aprendem a ter receio dessas diferenças quando um adulto as influencia a comportar-se dessa forma, e talvez censure essa curiosidade natural, ou reprima as perguntas na esperança que se comportem como criancinhas bem educadas.