Sounds like he might feel a little threatened by you now... as your mentor when growing up it seems like he is having trouble letting go of that relationship and is not accepting the fact that you have grown up and perhaps know a bit more than he does/ learned more than what he showed you so to speak .....i.e. the student surpasses the teacher scenario....... maybe if you paly a little clueless on something and let him give his 2 cents on that matter it might make him fell better or if he doesn't ever accept the changes from a young kid growing up and learning on his own he might never change...so just learn to accept him for who he is or hit that proverbial switch and let it roll off your shoulders