2 points... Arjun is unknowingly thinking about Radz all the time remember when nandini asked him if she is ok and he said yes rads is whereas nandini was asking about sam
secondly yes he is being rude because firsly Radz is distracting him which he knows very well.. some girl is distracting him from the revenge thingy which is deeprooted in his heart since childhood.. now he cant change in a day come on...but i am sure with time Radz will break all the walls and help him