To accept "marriage equality", one must also accept "parent equality" or the notion that it makes no difference at all whether children are raised by opposite- or same-sex couples. Otherwise, you would be implicitly acknowledging a societally significant difference between heterosexual and homosexual relationships and that's just vile bigotry. Therefore, you must accept that opposite-sex parents are the SAME as same-sex "parents", and that, in turn, means that "parenting" is an asexual enterprise and, thus, we have all been raised by amoebas.
I was raised by a man and a woman. I refuse to say that I was raised by amoebas. Therefore, I refuse to say "parent equality" is anything other than an absurdity, and, therefore, I say that I will always have nothing but spitting contempt for the insulting lunacy known as "marriage equality".