I think it's important to lead with a full on disclaimer of "Everyone's stutter is different with different root causes." Blah blah responsible response blah blah... I was diagnosed with General Anxiety Disorder 10 years ago by a dismissive doctor and didn't have the money to get further treatment/diagnosis. I am absolutely more sensitive to others tone of voice when they're angry/upset and my stutter definitely worsens as the other party gets more upset.