Eduardo is from brazil. he is fluent in both portuguese and english. when he uses english to speak to you of his home in brazil, he seems to have trouble remembering details. yet when he is speaking portuguese to another brazilian, he has no trouble remembering. this phenomenon can best be explained by

it can be both; depending on the situation at hand.

explanation:

let's just say i get in to a confrontation with someone, and they say "ur mom", it could be seen as an insult. or depending on the relationship or comfortability with the person it may be seen as a joke. the distinct line is how the chemistry behind the confrontation.