Has anyone ever had a strong opinion about something, someone, or some event, and then felt stupid (for lack of a better word) after expressing it to your T?

Basically I recently found out something shocking regarding my sister. It's still fresh so I am in the angry, disbelieving stage and I just wanted to rant with my T. This is something that I have never done because I have rarely expressed anger in therapy. She has brought up that I don't allow myself to get angry before, so yesterday I decided to be brave and not censor myself and let her know what I was really thinking. I felt... judged? She understood, but she said something like "people who think this way don't understand that _____." So she didn't directly say "you don't understand_______," but I felt like she thought I was being unaccepting and judgmental for my opinion. And now I just feel embarrassed for telling her what I was really thinking and feel like I shouldn't have. I was very mindful of her choosing her words carefully and being afraid that she would say the wrong thing, so I got angry at her too.

Anyone experience something similar?