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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SW-User

Should be whom not who! Lol

@SW-User Not for most sentences. "Whom" is only used in sentences like: "to whom are you referring to"

SW-User

@everythingisalreadytakenagain the 'Lol' at the end is a clue. *no humour here!*

@SW-User lol

*humor