well what are you feeding him now? If it's frozen/thawed, most of the time they see no need to constrict it. This is really the same with a live pinky or fuzzy. so small its pointless. some constrict every time. It depends on the personality of the snake. My black rat, one of my tx bairdis, and blue beauty will constrict anything, the others dont really care. you may also want to get a pair of kitchen tongs and hold the tail and dangle it around the face...which will make it appear alive. my black rat only constricts if it is fed like this. my licorice stick just opens her mouth and lets me put it in there, lol.
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My Website
Rat/Corn snake care sheet I wrote
Current snakes:
0.1 Licorice Stick Black Rat (Lola)
1.0 Neonate Black Rat (het for Lic Stk's) (Frankie)
1.1 Texas Bairds (Jose and Rosa)
0.1 Blue Beauty (Brunhilde)