Why do people have conversations on speaker phone in public?

I’m at the salon and a woman is getting a pedicure and she’s having a full conversation on speaker.

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I'm to the point that I don't go out unless I have to, for the shortest periods possible so I minimize my dealing with humanoids and their selfishness and idiosyncrasies, unless it's to go fishing or something alone in the wilderness. Even that is not a total escape.