So in this case the feminine 'le' is assumed as there is not context. If it was 'li' then would it be assumed as a masculine context?
lui li vede - he watches them( masculine), io le mangio - I eat them ( feminine) object direct ( ask for complement)- io- mi , tu -ti, lui- lo, lei -la, noi-ci , voi-vi , loro masculine - li, loro feminine- le. object indirect (don't ask for complement) io- mi, tu - ti, lui-gli- lei- le, noi´- ci, voi- vi, loro- gli.
I took all three charts for reflexive pronouns, direct object pronouns, and indirect object pronouns from the link dnovinc recommends above
and melted them down into one chart, then reverse indexed them so that one I could see what each pronoun could possibly mean .. it seemed to help as I first walked through the clitic section to have a chart to look up by pronoun.
(Humble) suggestion for DL: this would be easier to understand if you gave two sentences ie. "I don't eat apples. I don't eat them". Non mangio mele. Non le mangio. And "I don't watch TV. I don't watch it". Non guarda la televisione. Non la guarda. And "I don't read books. I don't read them" Non leggo libri. Non li leggo. etc. So we could more easily apprehend what you are trying to teach us about direct object pronouns. Thank you for your kind attention.
I have read the comments below and I checked out the link recommended, but I must say I do not understand the difference between li and le. From what I have read and learned about these pronouns, they are replacing something, and in this case the le or li refers to them, which could be anything really, vegetables, meat, fruit. So how is it that we can assume that this is a feminine them? We really do not know what "them" is here, so does it really matter if you use li, which is masculine or le which is feminine?