My mother insisted that because her bath water was cold she needed a new water heater. I called the plumber who had been at our home before. When he was there before he fixed two of three toilets. It seemed the heater problem was not a plumbing issue but a mother issue. My mom told him to replace the heater then began to insult him. I told her to stop but she continued. As he left she refused to pay him for the visit. I sent an email apology to the plumbing company. What in the world happened here? Is this dementia?