In my experience, making fun was more common in school <18, in adult people usually are more reserved in saying shit. Or maybe because Im 6'5''/195cm, I noticed that normal people can understand that someone can stutter, someone can have autism, be deaf, be disabled and normal circles, making fun of those people are cringe. I read some girls find it cute but I never heard it irl. So if you meet people who make fun of you, your stuttering and you are not okay with it, better for you, so you can quickly dont trust them/dont be friend with them, like would you like to be friend with asshole? No.