Being gay is not a civil right.
Homosexual marriage is not a civil right.
Post 80 gives a simple example on why this is a ridiculous stance.
I agree with the first two sentences of your post. But there are many who would argue the opposite, and claiming that civil rights are never about behavior, I think, is a weak argument. We’re on the same side, I’m just trying to point out what I believe is an argument that is not particularly useful when defending our beliefs. So, once again, my simple point is that sometimes civil rights are indeed behavior-based, as is clear when one reads the Bill of Rights.