No two people who stutter are alike. When talking to someone who stutters, use compassion and common sense – would you like to always get random advice from others that make you feel inferior?
In life, you are bound to meet one, if not many, people who stutter. If you think “I actually have never encountered someone who stutters”, chances are that you have, and did not realize it (given that 1% of the entire population stutters). If you were aware of the person’s stuttering, how did you react? Did you feel uncomfortable or think you might have done something wrong?