Do you think if somebody is a Doctor of something ( has a doctorate, not medical doctor) that you should address them as Dr when talking to them?

My father liked to be called Doc by his students. It was like a nickname for him...(better than Dollar Bob!) 🤣🤣🤣. He did have a doctoral degree, and was not really pretentious like Jill Biden, but I think he still wanted his hard work to be recognized at the college where he ended up working.