I get this on the daily at my work, it literally makes me want to lose my shit. I work as customer service staff which involves handling a lot of money and unique tasks but they try to make ME feel like the stupid one. Every opportunity I get I’ll tell them I have a stutter and the line varies from “excuse me I have a stutter” to “I have a stutter, it doesn’t effect my intelligence, you don’t need to talk to me like that”, depending on my anger level.