A sensitive child might be acutely aware of what's going on and they may feel that the food and such are a bribe. As a person who had a severe stutter, even when I found nice people, I was physically unable to express myself to them. I was unable to say the words I wanted to, with the timing that was necessary. Often, my tone was incorrect and I ended up accidentally interrupting because of how long it took to get my words out. ​ I strongly suggest to find a speech therapist who SPECIALIZES in dysfluency (as its an entirely different thing from an articulation disorder).