"when I was growing up women were feminine and men were chivalrous".
Femininity was imposed on women and still is and domestic violence from all those "chivalrous" men was as prevalent as it is today.
"so resentment has built against feminists"
Yeah, people whose power base is being attacked tend to resent it.
"when I was your age a young lady like you, would have been able to charm the birds out of the trees"
In other words, it's her fault for not being charming enough. The reason many men were nice to women and allowed themselves to be "charmed" was because women didn't challenge them. When women challenge men, they show their true colours.
"so why has it turned to open warfare between you and young men"
Rebecca's not conducting a war against young men, they're conducting a war on her.
"First you need to remember that only men who respect you are worth concerning yourself with, then that by only associating with those men, remember that men like to talk big, but it is only talk and not to be taken too seriously. At all times stay well away from the wrong men, don't debate with them or even talk to them, their opinions or beliefs are irrelevant"
Right, so leave those men to dominate the public space and just STFU, right?
As for her using more charm - misogynists aren't interested in her charm, they don't believe she has a right to be in that environment because she is a woman.