Wow, really? Ok.. lessee.... I can't keep up with the state PC lists, but the federal lists don't cover:
Ugly people.
Dumb people.
Fat people.
Sick people.
Poor people.
Short people.
Smelly people.
....
There's really no end to the irrational biases people can dream up.
The people decide which groups they want to protect, usually based on a history of particularly egregious discrimination. All of which you already know.
And in the State of Oregon that includes gays and lesbians. True, the Oregon PA law wasn't in effect as the Earth began to cool and form an atmosphere. But it has existed since 2008. Well before the controversy.
The list of folks protected under PA laws isn't that long. If you're confused and confounded by who is covered in your state, consult a lawyer. They'll do the heavy lifting and read those 2 paragraphs or so for you and then explain it. Consider it the cost of doing business.