Firstly, a therapist’s job isn’t to agree with everything you say/think. So you’re wrong from the outset in terms of her having voiced her opinions. As a therapist she may have sought to talk about the issue further, but the fact is she’s not your therapist, and in fact it would be unprofessional of her to even act in a therapist capacity with you.
Secondly, just because she’s your friend doesn’t mean she’s obliged to hold the same opinions as you do. In fact it’s quite an unhealthy dynamic to have only friends who think the same as you do about everything. Where’s the room for discussion on any matter then?
Lastly, NC is a very grey area. People throw the term around lightly on here. Family member upsets you? “Go NC.” Grandparents fed the kids Haribo? “Go NC.” Even on here because your friend doesn’t agree with you, “go NC.”
There are of course perfectly justifiable reasons for cutting off a family member, but even then people often do so in the moment.
Because the thing about NC is that it’s forever. But so many people don’t seem to think about that in the moment, because it’s usually a specific incident which takes them there. And then two/five/ten years down the line the family member dies and they’re hit with an unexpected grief and in many instances even regret. Even though that was their choice.
So when you decide to cut all contact, you have to ask yourself the question, are you content to now think of that person as dead?
Moreover, are you happy to lose other family members because of family functions you won’t attend as that (now dead to you) will be there? Because while people may understand in the beginning, as time goes by they’ll just assume you won’t be there so invitations won’t be forthcoming.
The fact here is that there’s no right or wrong answer. But the reality is that if you wish to stay NC, then you’re responsible for the path that takes, including if that means losing other relationships.
If you’re happy with that choice, and if you truly think the relationship has broken down irretrievably, then you will carry on regardless.
But the fact that your friend’s suggestion that you’re wrong has upset you sounds like you’re not as sure as you’d like to be. And that may need exploring.
Remember you can still be low contact, resuming contact doesn’t mean full relationship status. It’s still possible to keep someone at a distance without cutting them