I think Golden Age Steve Trevor would go on about Wonder Woman to Diana, too. Though since Golden Age Steve Trevor wasn't a dick, I'm willing to believe he was just so smitten with Wonder Woman he couldn't stop talking about her to all his friends, one of whom was Diana. So it went from "I'd rather be on a date with Woman Woman, who I'm in love with, than going out platonicly with you," to "I'd rather be on a date with Wonder Woman than on a date with you because she's much hotter." I've probably said enough stupid things to women that I should give Steve some leeway here, but raving about Wonder Woman's "knockout figure" to Diana seems like crossing a line.
Also, I think Golden Age Steve Trevor apologized to Diana for being a jerk at least once.