Don’t accuse the other side. Just make note of what they are doing. If a person constantly interrupts you, look him in the eye, use his name, and say “Mike, you interrupted me.” Or ask “May I finish my sentence?” Use a nonconfrontational, matter-of-fact tone. If Mike does it again, patiently remind him, perhaps with a little gentle prodding, “Hey, you’re interrupting me.” Think of yourself as a friend giving him some useful feedback. Call him on his behavior—nicely.