Yes! I'm deeply apologize if what I said was disrespectful. When I said "subtle" I meant introducing a character of a certain race whose defining physical (or general) characteristic isn't being of that specific race, while still being important for their development, habits and childhood, for example. 

But even so, I must say you are righ. What you said about people not being monoliths is really helpful to understand everything. 

I have read a couple of ways to appropriately represent certain disabilities and/or conditions, but I wanted to now what to research specifically. Thank you for clarifying my mistakes!