I will take offense to that. I didn't say it was a requirement for anyone, not even myself. I said it was my preference. I PREFER such games, especially if I am going to share them with my kids. I want them to see themselves reflected in the media they consume, especially if that can be in the role of a hero.
In pixel games I imagine it is even easier than most other art styles becuase it is as simple as alternate sprite sets. The same way you can run into green, red, and blue versions of a single type of monster? That works for characters and NPCs.
I would ask what's the point of objecting to someone asking about that? Especially if they aren't sating it is mandatory. What result were you hoping to get from someone asking, "I like X, is there any of that in your game?"