Well, it seems as if you are not the target of the page so you have no legal standing to do anything. If FB will not take it down voluntarily, it would be up to the person(s) being defamed to enforce their rights.
The answer(s) herein do not constitute the establishment of an attorney/client relationship, nor are they intended to constitute the practice of law in any State. The answer(s) are based on extremely limited information provided by the submitter and are for general information purposes only. The original submitter, and those viewing these answer(s) are highly encouraged to seek out and engage legal counsel in their jurisdiction to review the entire matter.
There is an option on Facebook to report inappropriate pages, especially those with an ethnically or racially offensive component. Perhaps the administrator didn't know that Hmongs are an ethnic group. You should report it using the "Report Harassment" features on Facebook, and encourage others to do so as well.
As for legal claims, I don't see grounds for defamation if you are not the subject. Furthermore you'd have to show damages. Unfortunately, there is a gap between what the law forbids and what common decency forbids, and within that gap is where cyber bullies can flourish. For those situations you have to seek technical remedies, such as blocking accounts or reporting harassment to the service provider. And of course, encourage your legislators to be more proactive and informed about cyber bullying, and the damage that it can cause.
Best of luck.
The author is a Maryland attorney; however no answer given on Avvo is intended as legal advice or intended to create an attorney-client relationship. Dan's expertise lies in the electronic entertainment (video game) industry, as well as complex internet law issues, electronic free speech, entertainment law, copyright and trademark law, and computer fraud. He primarily represents game developers and founders of emergent internet technologies.