Yeah do some training with him and just make sure you really wap on the nikkyo's n sankyo's
Remember tho you are both learning even when you reach 10th dan but you should also remind him of this fact and if he insists on stating your wrong or contradicts you infront of the class then make sure your sensei notices, has he recently got a black belt?
is the power going to his head?
is he trying to be an evil overlord before he's been a minion?
(ignore the last one if your not into world domination)