I was driving in the rain. My b-i-l was in the passenger seat. The screen must have been misting from the top down. I am short so the misting had not come down as low as my eyes and I had a perfect view. My b-i-l was noticing the misting on his side but instead of asking me to switch on the de-mister, he leaned over the dashboard, said 'You need to clear the windscreen. It's this button here' and bldy well pressed it himself! My surprise was obvious and I told him a I wasn't experiencing reduced view and b I normally make my own decisions. I was so angry! You do not lean across and push buttons in someone else's car when they are driving. Do you? He cold simply have asked! He was back this Christmas so as soon as he got in and sat in the passenger seat I said 'If you would like any adjustments made, eg heating, de-misting, just ask, rather than pressing buttons. I prefer it to be just me who touches the controls' and he really took the hump! I'm not really asking for advice, I just want to call the buer out. There were other incidents. I feel I wouldn't care if I never saw him again.