Trying to categorize people into strict definitions for the purpose of determining their responsibilities without considering feedback from the people themselves about how they want to categorize themselves violates Kant's categorical imperative, also known as Granny Weatherwax's definition of sin as “when you treat people as things”:
The nature of sin
“There is a very interesting debate raging at the moment about the nature of sin, for example.”
“And what do they think? Against it, are they?”
“It’s not as simple as that. It’s not a black and white issue. There are so many shades of gray.”
“Nope.”
“Pardon?”
“There’s no grays, only white that’s got grubby. I’m surprised you don’t know that. And sin, young man, is when you treat people as things. Including yourself. That’s what sin is.”
“It’s a lot more complicated than that—”
“No. It ain’t. When people say things are a lot more complicated than that, they means they’re getting worried that they won’t like the truth. People as things, that’s where it starts.”
“Oh, I’m sure there are worse crimes—”
“But they starts with thinking about people as things . . .”