‘Whiplash’ Of LGBT protections and rights, from Obama to Trump.

Supporters of LGBTQ rights took to the street in a demonstration in front of the U.S. Supreme Court last October. (Image: Manuel Balce Ceneta/AP)

At the heart of a story now playing out in schools, workplaces and courts across the U.S. is a disagreement over the legal meaning of the word “sex” — and whether discrimination against gay and transgender people for being gay or…