Hard to say...
Could it be that the 9th Circuit Court of Appeals is really evil, or is it that they actually believe they would rule the same way had this been a school administrator's statement:
"A school administrator told [student] to “leave his [sexuality] in the car”"
Schools should be able to censor student speech, but they should do it reasonably and in good faith. They are run by unreasonable people who live in fear of even more unreasonable people, like the Anti-Christ Lawyers Union and some of the lunatic 9th Circus judges. Since the schools will not censor political speech reasonably and in a fair manner, they should not censor it at all.