I've had the same feeling. Then I start to wonder if this is how everyone views me. If even a fellow stutterer feels impatient, how can I expect people with out the issue to feel this way? Then one day I realized it's because it's a reflection of something in myself that bothers me more than I let on. That's why I feel annoyed. It's much harder to ignore the traits in yourself that bother you when you see them in other people.