A change in route can be practical without becoming a debate about who was right earlier.

Once a wrong turn has been taken, the conversation splits into two: what to do now, and whose fault this was. The second is more emotionally interesting, and it consumes the time that could have gone into the first. Being right about the past does not shorten the remaining distance by a single mile.

When something goes off course, put the correction first and the accounting later, if at all. Say what happens next in plain terms, and let the earlier disagreement stay unresolved rather than paying for it twice.