Socialism

There's still tons of people who will judge you for having children without getting married. A lot of religious groups still consider it a moral failure. And even if it was completely accepted now, it still became an insult in the first place because of that stigma, and you'd still be using it within that historical context. You can't reclaim a slur by continuing to use it as an insult and ignoring where it comes from.

As an example, I've seen pretty many people use slurs for Romani people as a term for getting scammed or cheated. Usually they didn't know the origin of the term, and didn't mean any harm by it. They had heard it being used and assumed it was just another word. But you don't just accept the definition these people have in their heads as an alternate definition, disconnected from the original. It has the meaning it does based on bigoted stereotypes, and by using it they're still spreading that, even if they aren't hateful themselves.