A gentleman asshole is the type who is a nice guy you respectful, the type that would help a old lady across the street but the moment you disrespect them they will put you down a peg.
"Hey I'm not a bad guy I'm just a gentleman asshole, there is a huge difference hun."
The type of guy that would open doors for his lady but the moment she starts getting out of line he will stand up for himself not caring about the double standards.
“Honey I’m not an asshole, I’m a gentleman asshole, there is a different.”