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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PaleandPolluted · 36-40, F

It’s is an abbreviation for it is hence the apostrophe

hunkalove · 70-79, M

@PaleandPolluted "It's" is an abbreviation of "It is". "Its" means it belongs to it.

PaleandPolluted · 36-40, F

@hunkalove 🤔 Oh yeah. I’ve only just found out a lot and as well are two words lol