It had happened to me too when I offered condolences or sympathy,it actually angered the grieving person.In that scenario, my advice is to not to take it to heart.When somebody is in loss and grief,he or she may behave in an unexpected way.I offer brief condolences.Sometimes I offer it through a text or send a card first. Later visit personally depending on the depth of our relationship.We can't always prepare in advance regarding such situations.