You suffer from a mental illness – you have a delusional, unfounded, unwarranted hatred of gay Americans whom you seek to disadvantage through force of law for no other reason than who they are.
Fortunately the Constitution prohibits you from doing so, but you are at liberty to continue to wallow in your own bigotry and hate.
Can you direct me to the part of the Constitution you are referring to when you claim special rights for gay sexual behaviors (no such thing as "gay Americans" anymore than there are "alcholic Americans" as a class). Behaviors don't get special unwritten protections in the Constitution. When behaviors are protected, they are specified. No such specification exists for homosexuality in the Constitution.
You can decriminalize people getting drunk. You just can't take the legal leap from there and say "drunk Americans have the right to drive like everyone else!". Gays cannot provide both a mother and father to children: implicit partners in the marriage contract. Therefore, gays guarantee a psychological "car wreck" to the other parties to marriage: the most important ones as it turns out..
And, New York vs Ferber (1982) says that even if homosexuality had explicit written protections in the Constitution (which it doesn't, but for argument's sake...) to marry, if such a union results in harm to children either physically or mentally (by stripping children of either a mother or father for life) that "right" is no longer protected..
States' first and foremost duty is to protect children. Secondarily they look to protect delineated adult Constitutional rights.