So I’m actually going to agree with this, with a caveat, having learned from personal experience - because sometimes we do have to keep talking to these people for work/education/family purposes. When they start arguing about their choice of phone being better, ignore them. But do continue to respond to them about things you need to talk to them about. Or, in short, grey rock the hell out of them.

Method successfully deployed against a guy at university who picked fights about everything, including what phones people had.