That therapist sounds terrible honestly. Jumping into a joint session with an enabler of something as horrific as that without doing a 1-1 with your mother beforehand to get an understanding and judging if it really would be beneficial to put you both in the same room and work through something like that,

It feels like a massive echo chamber in most regards

An ironic image to post on Reddit

That is the biggest misnomer for lack of a better word. To expand on your analogy, I can talk about the islamic faith and consider converting to it from a christian background. I can talk about the flaws in christanity compared to judaism compared to islam and so on. Everyone has the free will to engage in these conversations or beliefs. In segregation you are preventing anyone from engaging who doesn't fit a racial profile.

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I have gone into a mosque to talk with an Imam about Islam and was welcomed and encouraged. Would that be the same in this scenario of segregation?

so it's not forced segregation but optional segregation. How is that distinction any better in response to his comment?