I agree with the people saying that he already knows. I always just assume, especially after stuttering a lot, that people mock me behind my back. It's unexpected, there's not a lot of people who stutter. Most people just don't know how to act. I worked at CVS and these young girls asked me to find something. My co worker came back to me later and said "those girls were making fun of you." I was like "no shit". I don't blame her for bringing it to my attention, but it's just something I expect. People are dicks, especially when you work customer service.