Most of the people we meet aren't of our own choice. What can someone do if their teacher discrimates against them because of their speech? Or if they get fired with that as an argument? It's good if you haven't experienced these things, maybe your stutter isn't severe, maybe you live in a benevolent society or you're persuading yourself that these things are in your head (although that requires a high level of self-gaslighting) but invalidating people's negative experiences does more harm than good. Of course, thinking that absolutely everybody finds you ridiculous is also bad but let's have some nuance, you can exaggerate on some things and still be right on others. Accepting your stutter also means accepting some of its consequences as external, some people are ableist yet it's not my fault for being different, and I live better that way than believing that every mockery or discrimination I've endured was created/misunderstood by me alone. I find it sad that so many stutterers insist on only blaming themselves for everything when we live in a society.