in my own experience & area , people dont really care but some people think their helping & they will finish wtv your saying while others patiently wait for you to get done. You can only control how you feel & react to the stutter. Try to make it positive for your mental health plzz i went thru this & it can increase to insecurity and social avoidance but just attempt to say something to or crack a joke to everyone that does mimic you cuz they gonna keep doing it if u don’t say anything but you knew that tho Just don’t be a sad annoying bitch about it. U Got It Bro