Why do some people use "that" instead of "who" for a person?

For example: "a person that likes my glasses" should really be "a person who likes my glasses"

Also, why do some people spell "its" as "it's"?

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hunkalove · 70-79, M

That bothers me too. I was upset to see a movie titled The Killer That Stalked New York (1950), but it's right, "that" not "who".

@hunkalove That would upset me too. It's just so obvious that "who/whom" are the only grammatically correct words to refer to a person.

covfefe234 · 31-35, M