I can speak for myself: Its so hard for me to accept stuttering because stuttering is not something I see people commonly do. Even if I see someone stuttering they stutter gracefully. In my case its more of a block due to the hesitation. I don't like my stuttering self and am scared to showcase it. Moreover in some critical situations where I absolutely need to sound assertive, I get more nervous and avoid the situation. Some days it gets so bad that I find letting my stutter out is better so I do stutter freely -> Then it gets better because I build confidence and start liking my brave self -> Then I become complacent and then back to my underconfident self.