At least where I’m from, this happens less as an adult. If this happens, walk away. They’re not worth your time, it is incredibly immature to mock someone over a stutter. I’ve had people in power criticize me for my stutter, but never mock. People I have had in handcuffs though, they mock. It’s less about the stutter and more because they feel powerless and are grasping at whatever vulnerabilities they can find. Lol