These terms are effectively dogwhistles, with whatever meaning du jour the propaganda machine decides.
A large number of people simply use words as weapons, for effect. Expletives detached from meaning.
If you asked one of them for a meaning, you might get a real word salad, concealing the unspoken meaning basically: "someone who supports Foreigners, Minorities, Women, Socialists, Gays and Liberals" [0]
Since the Lee Atwater "Southern Strategy" days the poor have been conned into supporting the very oligarchs who take away their health care, education, jobs and opportunity.