[ubernostrum]

There's more to it than that.

Some English dialects/accents are historically associated with lower-class people, or people perceived to be stupider/lazier/etc. Which creates all sorts of impressions on another person from the instant you open your mouth.

Many southern US accents have these kinds of connotations, for example, to such an extent that A) a lot of people won't take you seriously if you have such an accent and B) I'm glad mine got drilled out of me as a side effect of correcting for a lisp when I was a child.