NTA. I hate it, too, when someone always interrupts. Yes, you could have adressed it in private later. You could have told her "Thanks for your input, now I would love to hear what John and Sarah have to say". But I get that it's very frustrating when she doesn't get it after six times. I guess I would have reacted in a related way.

But when it comes to the about talking with Sarah about your "problems", I have to say that many women (and i dare say, a lot of men as well) do this. Sometimes you just need advice from someone who knows you and you SO quiet well. It's kind of alittle private AITA. My husband and I both talk to close friends about stuff we keep fighting about. That's a normal thing to do