Document what is said verbatim and then talk to your assigned faculty at the school. The faculty should be able to assist you in taking this information to the appropriate person at the hospital. This issue may even need to be resported to the State Board of Nursing - again, consult your faculty at school. Don't let it drop. Be prepared to go forward and quote chapter and verse of what was said and when. If your faculty is hesitant (sometimes they hate to make waves as clinical slots for students can be hard to obtain) go above his/her head to the director of your program. In our state (AZ) we can also make a confidential report to the Board of Nursing, all done 'online'.
I commend your professional attitude and your ethics. Keep pursuing this as this is a person who may need help but in the meantime shouldn't be spreading these thoughts in a nursing area.