Hispanics made fun of Juniorbush's Spanish, it was awful, but at least he tried. It may have done him more good than harm.
I said nothing whatever about "jive talk".
Obama did not speak any differently when he addressed the student body at my university, where there may have been around 3% non-Black people in attendance. Perhaps he can sound like Jesse Jackson, perhaps not, but if he can, I saw no evidence of it. He was VERY well received.