How should you deal with someone who's very egotistic and thinks they know everything?

Answer 1

Just agree with them, even if you really don't. Eventually they will sense the sarcasm and become angry. At this point you should calmly explain that they might not always be right when they think they are. Sooner or later they will have to agree. By disagreeing with them, that's just what they want and live off drama and the mere fact of being right. Don't go there. Smile, nod, and then I suggest you stay away from a person like this. Just sort of fade away from the person. If it's a mate or a dear friend, then you are going to have to tell them like it is and don't pull any punches!