It's an unreasonable distortion of the debate, designed to emotionally repel all who disagrees with your views on defining marriage, and wrongly mixing up civil rights with human rights.
The KKK encroached on people's HUMAN rights, obviously. And while you insist that marriage is a matter of civil rights, it's easily arguable that marriage is not a civil right for gays or straight people.
The legal "benefits" allowed within established relationships on the other hand, can be argued as civil rights. This means you should be campaigning for equal rights for civil unions rather than trying to get everyone to re-define what they believe to be "marriage", which doesn't seem to be working. You like to think that everyone is on the same page as you, but many people holding back expressing their opinion on this matter simply don't want to be accused by people like you of gay-hatred, bigotry and all the other pathetic labels you have for those who don't agree with you about what "marriage" is, its limits and scope, and how much of it is inherently about male + female union.