Are you sure? I find that I and a lot of people use it when referring to people of unknown gender.PBMcNair said:Basically, "they" is for people, and if memory serves, in some languages using the plural form is respectful.Alleged_Alec said:Sorry, but I really don't understand why 'it' would not be okay, while 'they' is.
"It" is for rocks, chairs and other inanimate objects. People generally don't like being objects.
It's not rare to know someone who is having a baby and ask them when is IT due or is IT a boy or a girl?