"Hagamos lo que dices. Siempre tienes razón", dijo Jose en un tono burlador y altivo."Let's do as you suggest. You're always right," said Jose in a mocking and scornful tone.
A masculine noun is used with masculine articles and adjectives (e.g. el hombre guapo, el sol amarillo).
Alicia, mantente alejada de Alfredo. No es más que un burlador que quiere usarte.Keep away from Alfredo, Alicia. He's just a Casanova who's wants to use you.
This means that the noun can be masculine or feminine, depending on the gender of person it refers to (e.g. el doctor, la doctora).