Your typical opponent to gay marriage is the religious right, not heterosexuals.
Please validate your example of hypocrisy be showing that Britteny Spears even opposes gay marriage.
Even though your marriage has no measurable affect on me, I know that your marriage is a sacred bond and I value it as such. You are in the fold. Your union matters. Your marriage has objective value.
The 'sanctity' argument brought by the religious right is fundamentally virtuous and true even though it has been bent to serve a politically expedient end.