Many guys are ignorant of many things before their Chosson Shmooze and the first few months of marriage. And guess what?! so are girls!!”
And why exactly have their fathers not set a better example for them by treating their mothers with courtesy, and why have their mothers failed to teach them social niceties? Your last line, is exactly why I admonished both the guys AND the girls.
My sons would never fail to show derech eretz to a date, and my daughters have never failed to say thank you and have a good night, even when the date was less than enjoyable. Is it REALLY sticking in your craw to open a car door and walk a girl to her door?