system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Talking on speakerphone in public is rude and unnecessary.

I can’t believe how often I encounter people in the store talking to someone on speakerphone. I really don’t understand why people do this. Your phone has a way for you to speak privately and also you can use a hands free set if you don’t want to hold the phone.

I know someone will say that it’s no different than two people talking in person in public, but I disagree. The phone is much louder than normal conversational tones and, it seems to me, that the social filters of politeness and propriety that generally applies when people are chatting public goes right out of the window when it’s a phone conversation. 

Finally, I know someone will argue a fringe case where it is necessary, like “my wife is about to go into labor, I had to get milk, and my phone is broken and only works on speakerphone.” Obviously there is always an exception, but these are not the types of things I hear talked about in the store.
gpt
It’s pretty subjective but conversation with Bluetooth headphones in public is more rude actually. There the risk of someone confusing your phone conversation with direct social interaction. With the speaker phone there is at least an clear acknowledgement that someone is in an independent-ish conversation. Ultimately, we tend to tune out many things that other people do in public quite easily, so why should this be any different? It’s not much worse than being at a crowded restaurant where the group next to you is having an audible private conversation.