makes me sick

ahhh, U know what I have this boardmates who is a freshmen student. Actually, I thought he has nice and humble attitude but eventually he's true colors shown up. I don't know if he know that 65% of that population of the bordas dislikes and maybe hates his talkative and vague attitude. There was one time that we talk about a certain discount card of a lifestyle brand and then I just said few but factual comments and never having a thought that he would react in such temper...that surprises me....I said at back of my mind, "thats it, there is must be something that I do to not to tolerate such attitude" Now heres the story: He shown to us a discount card of a certain store then I ask him if have you ever used that since he has already had that card for 5 years, he said no and so I told him in factual but in funny manner" whats the point of having that if you haven't even used that for once" and suddenly he reacted in seemingly hot tempered tone "don't give damn about it....i don't like senseless joke". What the hell was that? Then i just respond"ok I wont comment bout that" few minutes later walk out in their room...Then a day later he approach me as if nothing happened that night, I don't wanted....for continuation