It’s awful you had to be subjected to what I’d consider abuse. To answer your question No, I agree he shouldn’t have done that. When I’ve been with my mom Ive seen the nurse lift her left breast under her blouse or a gown and other times go under her blouse but never touched her nipples nor were here breast’s exposed. In the first place all that breast tissue is going to make hearing the heart sounds more difficult. There are some nurses here that I’m sure will be along to explains proper placement.
I would call the the County Medical Society although your State licensing board might be a better place. But the nurses will probably have better guidance than I do. When I reported a doctor to the County Medical Society they didn’t believe me even though I had irrefutable proof of his incompetence, however we did prevail in court. In our experiences doctors support doctors and aren’t interested in facts.
I wish you luck,