Someone that bitches and bitches and blames others for any failures. That is what a real man is for the white men of the MAGA cult.
The darker possibility is Republicans actually like Vance. His personality traits that alienate average Americans — his contempt, his pomposity, his unvarnished misogyny — are attractive in the upside-down world of MAGA. These are the same folks who listen to an elderly man in orange makeup whine for hours and somehow read that as “virility” and “strength.” Petulance is an admirable quality in the MAGA universe. Behaving like a jerk is aspirational. They don’t seem to get that bullies are usually overcompensating. People like Vance always punch down and kiss up, which is why he’s always fawning over Trump, a man he once privately compared to Hitler. This is weak and spineless behavior, but because it’s cruel, it reads as “mighty” in the sadistic alternative universe of MAGA.