Why are 'shitty genetics' implicit in a proposal of marriage? This is incoherent.
Unless... Oh, it's an incel. The fact that he has to offer marriage, lower himself to being the beta-cuck all incels feel that all husbands are, means he's not genetically endowed such that women approach HIM for sex. To dip his willy, he needs to symbolically offer his throat to the alpha wolf in offering his worldly goods to a predator (which incels feel all wives are).
Or, in the real world, people find each other and marry and it's a win, not a transaction. but incels just want the transaction. "Please tell me what i can offer that will make you get naked."