One person's Vital Force may be susceptible to vinegar and antidote their remedy, while another may not. This is not an exact science. It is people driven and experienced. Don't worry about it. Your homeopath should not 'chew you out' for it, either.
People are people.
Sometimes, we forget. Sometimes, we run into a situation where we have no idea that it will antidote our remedy. So, don't get up tight about this. Understanding, that the remedy can be re-given to you. This includes 'real' coffee as well as the de-caf variety.