That bill in Iowa that eliminates protection for LGBT people from bullying

The bill in question, HF 2291:

A BILL FOR

An Act relating to protected traits or characteristics of students under public and nonpublic school harassment and bullying prohibitions and policies.

[ ... ]

Section 1. Section 280.28, subsection 2, paragraph c, Code 2009, is amended to read as follows:

c. "Trait or characteristic of the student" includes but is not limited to age, color, creed, national origin, race, religion, marital status, sex, sexual orientation, gender identity, physical attributes, physical or mental ability or disability, ancestry, political party preference, political belief, socioeconomic status, or familial status.

EXPLANATION

This bill strikes sexual orientation and gender identity from the definition of the term "trait or characteristic of the student" used for purposes of protecting students in public and nonpublic schools from harassment and bullying.

Wasn't this kind of thing determined to be unconstitutional "animus" in Romer v. Evans, 517 U.S. 620 (1996)?