This.

And - there are bad therapists just like there are bad mothers and bad fathers and bad spouses and bad doctors. Those therapists deserve disdain if that is what the client feels. If someone had abusive parents and an unhappy childhood, we would understand if they vented and criticized and disdained them. Likewise with therapists.

And - some people would say that working out problems with a therapist is part of the process. Negative feelings surface and get expressed during such a process.

If you are lucky enough to have found a therapist that really helps you, count your blessings. Because not everyone is that lucky.