"No hablamos de tales hombres."
Translation:We do not talk of such men.
hablamos is present tense, isn't it? And if it is past, past tense has not been covered at this stage.
Hablamos is correct in two different tenses: "presente" and "preterito." So just standing alone as a word or standing in a sentence like the isolated phrase given by DL, we have no idea if the verb means "we talk" or "we talked." Hope that is helpful to you,