it simply just sounds like it doesnt interest him, maybe if he seen some other armies that you think would be "him", like it would be an army that would suit him the best, then maybe he could appreciate him, show him other GW hobbies too, maybe he will like fantasy, bloodbowl, or other games.
Warhammer:Skaven 9000 points, Lizardmen 1250 points
Warmachine:Dwarves 261 points, Trolls 125 points Gatormen 174 points
Malifaux: Gremlins 100 Soul Stones
Infinity: Morats 1400 points, Shasvastii 600 points