No employee should ever be treated with disrespect from anyone, especially their mentor. The person who should be building your team sounds like they are tearing it down. I have been a regional for over 10 years and was lucky to have the right VP who embraced our facility teams, especially the core of the IDT, the MDSC. It's better to build up your team than to frustrate them. I've found the same scenario you've described at the facility level and the MDS Coordinator was so distracted by their supervisor, the first half of my visit would be to repair what had been damaged. Unfortunately, she left the facility, taking her expertise with her. Your regional should be your advocate, your teacher, and above all professional. This type of behavior is not "the same all over". Feeling your pain.