Undeserved promotion?

I am looking for unbiased opinions here.

Tl;dr version: I rasied concerns about a coworker being harsh in her management style and her staffs wellbeing. She then became my manager. I applied and got a promotion under her. A colleague thinks I'm lacking integrity for applying for the promotion.

Recently, a new position opened up at my company and this position would be my new manager. I work with a small team of 10 people. One person (I will call her A) on the team I get along with fine professionally, but have a lot of issues with how she treats her subordinates and speaks with people and have been vocal about this to management long before the new position was announced. I knew she was going for the job and expressed my serious concerns to my colleagues and the hiring manager. The entirety of my team bar one lady (henceforth B) expressed the same concerns (amongst ourselves and to management) and that they would feel they need to switch jobs should A be appointed. A got the role and is now my manager. I reacted very poorly to the news, I was visibly upset when I was told by management and expressed why. My team (excl A) were brought into several meetings with HR and senior management to assure us they were aware of A's weaknesses in certain areas, and that sensitivity training was being arranged for her to enable her to do her new role effectively and we would each have individual check ins to see how we were finding the changes. This is likely due to all of us wanting to leave and requesting transfers when this was announced.

I congratulated A and remained respectful when dealing with her directly. I told upper management and my team that I was not happy, but willing to give A a chance. This is true, but also due to personal circumstances (visa restrictions) I cannot currently move company anyway.

As A has moved to be my manager, her previous role opened up. This role is a big step up for me. A will still be my manager in this new role. As I had already decided I will need to stay for at least 6 months for my visa, I applied and got the job. My logic was that if I am stuck with A being my manager, I may as well try to progress where I can. There were several other candidates, some internal but none directly on my team.

B is a close friend for years and I value her opinion. She knows how deeply I felt about my fears of A being my manager and my visa status. She never shared my concerns about A, but I confided my fears in her often.

When I told B I had gotten the role, she was horrified. She told me she was shocked and disappointed I had even applied after all I had said and done, and that I had attempted to poison my team against A (this I dispute. The team openly shared their feelings about A's behavior, not just to me but to management, but I agree I was the most adamant about concerns). That it was incredibly fake for me to "go on the way I had" and to now be looking for the promotion.

She said A had likely given me the job so I didn't "have a meltdown again" (unsure on this as to my knowledge, A is not aware how I feel about her, I have always been professional in personal dealings as she was never my manager, but was senior to me and she was the sole hiring manager for this role).

B is not envious of me getting the role, she has zero interest in it and it would not be a promotion for her, so I don't think jealousy is at play. She also already has permanent residency. When I interjected about my visa being a concern, B shut me down saying if I meant everything I had said I could just move departments, that I had been incredibly disingenuous and fake and she would be interested to see how I work with A now and how fake I will be.

I tried to explain that my feelings had been so strong based on fear, that I was afraid how A was going to treat us having seen how she was with her previous employees, but B was not receptive. Her main point was how fake I was and how disappointed she was in the company for letting me get away with my behavior.

The conversation really shook me. Have I showed extremely bad character in how I have handled this? I felt I was adapting to the changes as best I could and attempting to make the best of the situation, but now I have extreme doubts that I am unable to recognize how poorly I behaved and that I was promoted so I didn't become a crybaby again. I did request an internal transfer through HR, I was advised this would take 6 - 9 months. My confidence has shaken, I value B's opinion and know that she is saying what she genuinely thinks.

Sorry for the long post! So with that said - AITAH?