I think historically stuttering was seen purely as "speech impediment" and there were some crazy beliefs flying around about "treatment" which are still prevalent today. E.g. if a kid begins to stutter parents refer to SLP because they see it as a speech "issue" and they normally come looking for fluency techniques or give the kid all kinds of unhelpful advice e.g. "slow down" "take a deep breath" "say it again properly" "think before you speak" which makes the kid think there is something "wrong" with their speech and that's how the negative perceptions start.