'The right' as a term literally comes from supporters of the nobility and the king, the ultimate representation of someone who is protected but not bound by the law.

That doesn't seem to be what the quote is focused on though, where most efforts around "protected classes" come from. I think it does a rather good job highlighting it's point about conservative central hyperfocus on the supremacy of an in-group. Seems to be a pretty strong candidate for an underlying proposition at least, given some of the imagery we've seen over the past days.

What left wing ideologies would that be?

> […] all the "protected classes" tend to come from the left wing ideologies.

You don’t know what the term “protected class” means, and you should probably stop using it.

“Woman” isn’t a protected class, “sex” is. “Christian” isn’t a protected class, “religion” is.