Although not specifically mentioned in these “commandments” I agree with your objection. I’ve never understood why it’s become “discourteous” to carry on a conversation on the phone in public (when only strangers are one’s “company”), especially the growing trend among business owners to demand their customers not talk on a phone while shopping and/or paying for a purchase.
A business owner has the right to demand that of course, but it has no basis in rational thought. I’m “sorry” such people demand my full attention at the cash register, but trust me, I am fully capable of making a purchase and talking on a phone at the same time, just as if my friend on the phone were physically present with me.
It’s as you said: it’s as if some are just looking for something to complain about.
>>but trust me, I am fully capable of making a purchase and talking on a phone at the same time, just as if my friend on the phone were physically present with me.
Based on my experience being in line behind such people, this is NOT true for the vast majority of cell phone users. I have no problem with these rules by businesses and applaud them for it. Pause your conversation, single task for a minute, complete your transaction, and get the he** out of the way. Then carry on your conversation.