Offended Someone

Well, i did what i do best again today, I offended my NTU supervisor. We were just chatting when i mentioned what my DSO supervisor told me about him (the ntu guy) giving me too much guidance. But i think the manner i speak and my explanation is rather bad and his face changed totally. Then he said in a pissed off manner that ya, he is giving me too much information. After the incident, i emailed him to apologise but i think that the damage has already been done, nothing can change that now. Damn, why do i keep saying or doing the wrong things, last sem was like this (to a friend), this sem again. Maybe i should do something about it..