Yes, every chameleon is different, especially if they are new to you and their cage. If he is not getting aggressive when you offer your hand, that is a good sign. If it stresses him out however, then don't try it as often. Also, when he does come out, make sure to either bring him to a window or give him an extra treat right away. If he is "rewarded" somehow for being handled this could encourage him to do it more often.