Kadar broke his leg playing against Sunderland reserves after he sat on the bench a few times under Kinnear and said something along the lines of "I may have broken my leg but I stopped the player scoring which is all that matters".
I don't think there is anything wrong with Kadar's attitude. Pretty much all young players will go out and stuff, it's just whether he'll 'grow out' of it and decrease his number of nights out as he gets closer to the team.