I accepted a job offer from Company A a few months ago, but I never signed any contracts. Company B contacted me for an interview and gave me a better offer. I decided to accept it, so I notified Company A promptly that I would be rescinding my acceptance of their offer, stating that:
I recently received an offer from another company that I feel is more aligned with my needs at the present.
...and that I was going to take it, albeit with great difficulty since I was very attracted to the offer from Company A initially. I am nonetheless happy with my decision.
However, the recruiter from Company A contacted me today to tell me that she was very disappointed (Company A had put a lot of time, effort, and resources into my hiring process) and then asked:
I’d like some more detail about what opportunity you will be pursuing and what your reasoning was for choosing that over your Company A offer, if you don’t mind.
This is setting off alarms in my head. Should I respond? What should I say? I realize that I am likely blacklisted, but if my response could determine whether or not that would be the case, I'd like to avoid it, obviously; even then, I'd like to be as kind and professional as possible.