Yes, but

“We all know the phrase ‘Yes, but’ really means ‘No, and here’s why you’re wrong’,” says Rob Kendall, author of Workstorming. A conversation expert, Kendall sits in on other people’s meetings as an observer. The phrase “Yes, but” is one of the classic warning signs that you’re in an unwinnable conversation, he says. “If you hear it three or more times in one discussion, it’s a sign that you’re going nowhere.”  Kendall advises shifting the conversation by asking the other person “What’s needed here?” or, even better, “What do you need?” “It takes you from what I call ‘blamestorming’ to a solution-focused outcome.”  

Rosie Ifould writing in The Guardian