Last weekend, I went on a fairly long road trip with a bunch of friends. Everyone wanted their turn to play music, and we used a cable plugged into the Aux port. Each person would take the cable, plug it into their phone, play a few songs and pass it to the next person. If anyone's phone had not had a 3.5mm output, they would have been left out and we absolutely would have made fun of them for the whole trip. There is no way to get that functionality out of bluetooth, it would be a pita to keep repairing the car even if the car had bluetooth, which it didn't. And people aren't all going to replace their cars to get carplay next year either.
Have the iPhone user bring his own portable bluetooth speaker along. The rest can use use the audio jack all they want. Play your own music through your own speaker when it's your turn, bearing in mind never to be a jerk about it.
You may be thinking the person without the headphone jack could have used an adapter, but that assumes he would have remembered to bring it with since it wasn't planned that way, it just sort of happened. If he was just carrying BT or lightening headphones, he would have still been out of luck. And even if he had it, we still would have ridiculed him for a phone that needs an adapter. With fashion being a huge part of iPhone sales, who's going to buy a phone that makes them the odd one out in a group?
Change has got to start somewhere.
I remember the uphill task of trying to convert my friends and colleagues to Telegram. Despite its obvious technological superiority to WhatsApp (most notably there being proper desktop and tablet apps), many people were content using whatsapp because that's what they were accustomed to and where most of their friends and family were.
Switching to telegram also meant leaving years of whatsapp chat history behind, but fast forward to today, and I have more than rebuilt that chat history with a small but dedicated group of telegram users.
Ushering in a new world order can seem lonely at times when you go at it alone, and the rest of the world seems pitted against you, and there is often a huge switching cost as you have to rebuild your ecosystem from scratch, but someone has to take the first step. Maybe it will work out, maybe it won't. I am willing to give Apple that benefit of the doubt.
To your question, what I would do is to ensure that I am self-sufficient by having my own adaptors on me at all times so I am never caught unawares or become a burden in any situation, but at the same time, be ready to showcase the benefits and advantages of the path you have taken and the choices that you have made. I am not sure what alternatives could have been had in such a scenario. The onus will be on the iPhone user to hold his head up high, show that the headphone jack is somehow redundant, or that a better alternative exists, and be ready to stand by his choices and decisions.
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The gullibility of Apple cultists and drones is pathetic if they actually believe that compressed streaming audio is going to sound magically better through lightning connector headphone.
Maybe the point is that with compressed streaming audio, the quality is pretty much the same whether you use high-end, thousand-dollar wired headphones or a decent pair of bluetooth headphones. So you aren't giving up much in terms of listening experience by going wireless.