Like, someone you just met and doesn't know you? They're probably just being playful and didn't mean to pinch a nerve. Or someone who knows you're a stutterer and is bullying you? That's a shitty low blow that most people wouldn't be cool with, like mocking a kid for having a disability. Either way, forgive them because they know not what they do. They have no idea how you struggle and what you go through. And, life is going to be rough for you if you let others control your emotions like that. You have enough shit to deal with, let go of the rage. It gets you nowhere. Just forgive. It took me a while to learn this.