Critics on social media have come out sparring hard against Donald Trump over his demeaning characterization of what he sees as a segregated group of “Black jobs.” Trump has often railed against immigrants for taking what he calls “Black jobs,” and even “Hispanic jobs,” apparently indicating work just about anyone can get. He hasn’t detailed what specific jobs and professions he’s referring to, but critics suspect he isn’t talking about rocket scientists, molecular biologists, presidents or even real estate developers. Trump raised the issue again in his debate against President Joe Biden Thur…