It's not that I don't understand your argument, it's that I understand it has no merit. I explained this to you. That you continue to make an argument you know is false (I know you know it, because you quoted my explanation of your error in your post) is the part I don't understand.
Perhaps your confusion lies in your failure to understand that not all of us are right-wing homophobic bigots (or is that bigoted homophobes?) who feel compelled to handwave about how gay marriages aren't real in a feeble attempt to justify our bigotry and support of officially regarding homosexuals as second-class citizens. Yes, that's probably it; you're unable to comprehend that the rest of us aren't bigoted homophobes (or is that homophobic bigots?) so you can't possibly understand how anyone can take issue with your claim that marriages between gay people aren't "real". Or maybe you just lack the critical thinking skills necessary to see how your argument is garbage. Get a grownup to use their computer to look up "no true scotsman fallacy" and explain it to you. Since I'm such a nice guy, I'll provide an example:
GALT: Gay people cannot marry one another, because marriage is between a man and a woman.
GAY WOMAN: No. I married my girlfriend and we have three children between us. Got the wedding photos and in-laws and everything.
GALT: Well, that's not a true marriage, because a true marriage is between a man and a woman. If you marry another woman it won't be a true marriage, so preventing you from doing so doesn't prevent you from having a true marriage. You can still marry anyone you want.
The scottish original:
GALT: No scotsman would put salt on his porridge.
SCOTSMAN: I put salt on my porridge.
GALT: You obviously aren't a true scotsman, because no true scotsman puts salt on porridge.
And around and around you go, being wrong every time regardless of font size. Wikipedia describes the fallacy nicely thusly: "When faced with a counterexample to a universal claim, rather than denying the counterexample or rejecting the original universal claim, this fallacy modifies the subject of the assertion to exclude the specific case or others like it by rhetoric, without reference to any specific objective rule."
And that's that. You're wrong, and your argument has no merit.