Venezuelan, Colombian, Puerto Rican, Mexican, Argentinian, Chilean, Peruvian, Ecuadorian, Uruguayan, Paraguayan, Panamanian, Guatemalan, Costa Rican, Salvadorian, Dominican, Honduran, Cuban?

My 29-year old sister was basically chewed out by a complete stranger for not knowing how to speak Spanish--right here in America! We are about and 1/8 Mexican and an 1/8 Ecuadorian (with the other 75% being Danish, Dutch, French, Irish, Italian, and Scottish mixed in)--should we also be able to speak those 4 languages--along with the Irish and Scottish accents?