Well, if one goes to a Therapist is not because one is cheerful and happy. Therapists are supposed to know how to deal with all kind of human reactions so the individual that tried to justify your former T was wrong. I understand that Ts are human beings and can have bad days but they need to have self control and watch the way they talk to their clients. Respect and consideration are of utmost importance. And Ts do not need to like their clients. They have to be able to work with people they dislike. And if Ts feel rejection towards a particular client, they need to send the client with other Ts. Good Ts are not easily found.
I am pasting below a link that may be helpful Caregivers, Family & Friends