The saying, "when someone shows you who they are, believe them" comes to mind. I doubt he had any ill intent behind what he said, but nor does it sound like simple misspeaking or carelessness. What it sounds like to me is an unconscious attitude, similar to unconscious racism, that he has a major responsibility to explore and deal with in supervision. Given this, I don't see how I could feel the level of trust needed to heal with this T. But I would certainly try to not feel guilty in any way and use the interaction to get out my anger--and then seek healing with someone else.