I personally wouldn’t help because I hate when people do that to me, even though I know it usually comes from a good place. I would say something after though like “hey I stutter too, isn’t it the worst when that happens?” I love to connect with others who stutter. I am a more outgoing stutter that owns it when it happens but it doesn’t mean it isn’t hard and I def have my down days. It helps to talk to people who can actually relate.