I think if you're a person who stutters but you're chill, friendly/open, not socially awkward (aren't afraid of ppl, just speaking situations, will speak if spoken to) then you'll attract people with a bit more substance internally who don't turn their heads when they see your vulnerable side. Also you will just attract people with common interests. Prob some sport or activity y'all were playing consistently. This is more of a theory and it's hard to put into words what I've noticed about the friends in my life. But I think the people in my life also have something that they're struggling with as well. Something the don't tell other people and it really bothers them. I think for some people, this can humble them or make them more down to earth. They don't look down on people a lot of the times, because in some way, they can relate to the other person's struggle. It could be that the long term friends stutters have, are people with higher levels of empathy also.