I too have felt like my xT. was minimizing things that happened to me in the past. I don't know if he was minimizing or just being neutral but it felt minimizing to me. I don't know if it was because I would discuss things in a very factual no emotion way and he was just mirroring how I was discussing it...

But I did not feel it was helpful to me and if anything it made it harder to bring stuff up later because I thought it would just be minimized ...

I never talked to my xT. about it. I regret that now. I think you should talk to your T. of how you are interpretting his response.