Another one for Team OP!
Using a phone on speaker is obnoxious plain and simple unless you are in the privacy of your home or car. Not while others are around. It's amazing how manners have simply disappeared.
It is ESPECIALLY rude in an office WHERE EVERYONE CAN HEAR EVERYTHING!
The Dodo in my office who is a frequent offender of speaker phone misuse could not find his cell phone today. He proceeded to call it literally 25 times to try and find it. This genius of course did not find it but anyone close to his office got to listen to his annoying ring tone for 20 minutes. He did not think to check his office????
I would have thrown his phone out the window, except the windows do not open in my office.