I think that almost all traditional institutions are sexist, and they're probably racist and homophobic, and they're all of these things. But a lot of them, like marriage, are too embedded into the culture to give up.
You come to a point where you give up on holding yourself to a perfect feminist ideal — it just feels stifling.
People are not going to give up marriage. But we can try to make it more fair. We can try to change that institution and make it more equal.