He's not wrong. Once you learn to accept yourself and youre stuttering, it'll be a lot easier for you to just be yourself, since you won't have stuttering on your mind much or really worry about it. You'll just be you, just while stuttering. This isn't really controlling how other people react, but it's true that most people don't care. They dont care because they have no idea how hard it can be and as a result, they dont care too much about it beyond the initial confusion/curiosity. But if are talking and we're we're comfortable with our speech, are very nervous or have a lot of tension, that's likely going to make the listener uncomfortable too, especially if they don't know what's going on. So there's a difference between talking to someone while stuttering and talking to someone while under a lot of tension, anxiety, and shame. In the first example we can't control how people react, but in the second example our tension and anxiety can come across and affect our listener.