Appalling professionalism

I recently drove through Queenstown and needed to run a quick errand by Capitec before continuing with my journey. I was saddened and traumatised by how a lady that seemed to be the manager addressed the tellers. One lady and I exchanged looks of shock as she continued to humiliate her colleagues in front of us . What stood out for me was a threat that they know where to print a resignation form. This made me highly uncomfortable and I left immediately and proceeded with my journey with secondhand embarrassment for the workers. I’ve discussed this with several people and thought to come to a professional platform to get an understanding of the training managers receive at Capitec, as it made me and a few others uncomfortable, before I take it to a social media platform or change banks for one persons individual public behaviour. Kindly advise. Many thanks.