I'm sorry that happened. No excuse for that, they need a new director that encourages patient integration, not that us vs them attitude. In America you can make a complaint to PAIMI (protection and advocacy for individual with mental illness) which is under the disabilty rights organization. It's a national federally funded program that offers legal options. For NM I found 2 numbers. 505-256-3100 and 800-432-4682. They make sure hospitals are looking out for your rights. If you received no help they may be able to advocate. They ( if they accept your case) will investigate the hospital and may require the hospital to change some of its policies. Like specific action like requiring that staff must interact with the patients and supply groups. They are a legal aid type of organization and can investigate schools hospitals without a warrant.

All hospitals are required to supply you with the phone numbers for advocacy, those numbers should have been among the papers they gave you when you were admitted.