Chi's get such a bad stereotype for being ankle-biters. Mine has only bitten ONE person EVER (and he was protecting me since I'd had back surgery a week before and probably still smelled funny to him). As soon as I picked him up to scold him and show him what he did....he started licking the bite to apologize.
Mine is 200lbs of charm jammed into a 4lb dog. I think a lot of Chi's are that way and just get a bad rap.
I've met one or two meanies, but it's usually the owner who teaches them to be nasty to people, NOT a dog with a bad disposition.