I'm sure pretty privilege plays a part in being more confident, but from my experience, most people don't make fun of stutterers because they don't want to be perceived as an asshole. I'm a woman and consider myself average-looking. Providing I act friendly and confident, I don't have issues getting along with people and making friends, even if I stutter from time to time. As for dating, it's hard to say what my luck would be like, because I found an amazing guy and settled down at 18. But I suspect if I was still on the scene, my looks would hold me back more than my stutter tbh. Tl:dr pretty privilege helps. But I think it's the lack of confidence that holds many people back, rather than the stutter itself.