Is Tinker vs. Des Moines Independent Community School District no longer precedent?

The Supreme Court did not accept the appeal in L.M. vs. Middleborough
(Massachusetts). L.M. was a student at John T. Nichols Middle School,
who was not permitted to wear a t-shirt with the statement that there
are only two genders. Decision of the First Circuit stands.

The appellate court ruled that, in keeping with Tinker vs. Des Moines
Independent Community School District (1969) that the words would be
disruptive as transgender students would feel targeted.

The kid got it wrong; the number of genders is between 49 and infinity;
he meant two sexes.

I wonder if the boy would have had academic freedom if he'd written that
in an essay for biology class or on an exam.

https://apnews.com/article/supreme-court-massachusetts-lgbtq-tshirt-student-speech-e04fa045740e3e8ab21b0e14781ce3ad

Just burn the opinion.

It can hardly be argued that either students or teachers shed
their constitutional rights to freedom of speech or expression
at the schoolhouse gate.
-- Abe Fortas