I think telling any client they are therapy resistant is shaming and unprofessional and diminishes them of all responsibility. I have been told I’m resistant in the past. I definitely wasn’t I was just terrified of making myself vulnerable because the risk of getting hurt again was too much for me to bare. Any adept therapist would look at that scenario and say some of the responsibility fell to the therapist to ensure they created an environment for me to feel safe enough to drop some of the barriers that made me look like I was resistant. If they were incapable of making that happen then clearly the relationship just wasn’t a good match.
If I were you I would get away as quick as possible, as shaming a client like that is not acceptable no matter how good his credentials may be.