That's exactly a statement that's both true and unsympathetic. I mean it's just an empirically verifiable fact through surveys that if a person self vocalizes

That's exactly a statement that's both true and unsympathetic. I mean it's just an empirically verifiable fact through surveys that if a person self vocalizes in public, the average person (in the US) would be afraid to approach that person. I would say that the OP's advice is useful for people who can control self vocalizations and didn't know that was seen negatively by the average person. It is NOT useful for people who can't control their self vocalizations, or people who already know about the fact.