(a) A governmental subdivision or agency may not enact or enforce a law that prohibits:
(1) the display of:
(A) a municipal flag;
(B) the state flag;
(C) the flag of another state of the United States;
(D) the United States flag; or
(E) the flag of a nation other than the United States; or
(2) any conduct covered by this subchapter.
(b) This section does not prohibit a governmental subdivision or agency from enacting or enforcing a law to protect the public health or safety.