First get a good lawyer.
What you did is/should be protected by the first amendment. Those who hate American have no problem burning an American Flag or worse*, and they are seldom if ever charged with criminal activity when they burn an American Flag.
The Supreme Court had no problem with the burning of an American Flag in Texas vs Johnson, as they saw that act as Free Speech.
The link below will take you to that case:
http://www.firstamendmentcenter.org/faclibrary/case.aspx?id=1787
Who, knows, your local ACLU might want to support you.
Have someone search the files of New Mexico newspapers for pictures of American flag burning or descretion by La Raza and other Mexican Hate America groups.
*Beckwith, would you please post the link to what the Portland Hatriotic did to an American Flag in Portland.
There are many pictures of US Flag burnings by Mexicans. Here's one.
http://www.theterryandersonshow.com/
Here are dozens of photos:
http://images.google.com/images?client=firefox-a&channel=s&rls=org.mozilla%3Aen-US%3Aofficial&hl=en&q=Mexican++burn+US+Flag&btnG=Search+Images&gbv=2
I suggest as many of these photos as possible be sent to the institution doing all the complaining.