Its sad, but we can say this all day long, but execution of postive self reinforcement is easier said than done. Whenever i have a negative stutter expierence, it will linger in my head at some capacity of intensity for weeks, months, or sometimes years. Thats just me. And if this is how i feel, im sure a streamer whos job is literally to read peoples comments on him, his performance ect ect, it has to weigh on him regardless of how positive he feels 90% of the time. Because when the cell wall breaks, immediately all sources of infection come flooding in without discrimination.