I'm driving in OH home country. Same rules as my home country. I mention how it's annoying that cars ahead won't take over slow car towing caravan. OH says it's not safe and I say I think I've seen a few spaces where it would have been safe. I couldn't make a move as I was about 4 cars back so I need to wait for others to move. OH begins to rant about how I'm so arrogant and don't understand anything as we don't overtake in my country (UK). At first, I think this is a bit silly and say so, but he continues and I have to say a few times how ridiculous this is over just my first simple.comment. Actually escalates into a real disagreement even with me saying this is really unnecessary.