I don't think it has anything to do with what someone deserves or not. Some people (psychologists/psychotherapists) are just not cut out to work with certain problems (unconscious anger/rage) because they would not be able to manage their own countertransferences.

Other (probably a minority) therapists can work with such things and they wouldn't be offended. They know it is part of the process and has nothing to do with someone deserving or not deserving something. My own T has a hard and strict line on offending behaviour, i.e. when I would try to physically attack him. Taking, digesting and making sense of verbal and emotional attacks is something he considers to be his job.