HOLY SHIT. I had to go away and come back to this before I could form a coherent answer through the incandescent rage.
Good job parenting, LW. Your son's friends parents and people with attitudes like theirs are at least a big part of the reason parents of girls have more to worry about. Or, put another way, if parents of sons raised them to care about the safety and happiness of their friends*, regardless of gender, as opposed to the "boys will be boys" vibe I'm getting from your son's friends' parents, parents of girls would not have appreciably more to worry about than parents of boys, not least because even if some of the boys in a given group got rapey or even just harassy, some of the others would be likely to upstand instead of bystand. (I'm reminded of William Pollack's Real Boys here--- "protect your friends from harm" is or used to be a very normal "traditionally masculine" value for boys to internalize, and while it also traditionally came with horrible baggage, keeping the "help your friends be safe" part without the misogyny might be something to consider. "Friends don't let friend commit acquaintance rape" is another value to be teaching young men, along the lines of "you don't want to be that dude, and I know I sure as hell don't want the reputation of being a guy who thinks it's okay to be that dude, because girls talk to each other and warn each other about that dude", but I digress.)
*I mean, caring about the safety and happiness of friends is a good value for anyone to learn young, regardless of gender, but women do seem to get a lot more of the socialization around caring about how other people feel, whether the people in their group are enjoying themselves at a party, etc. And as for safety, when I've had jobs or other activities with late hours as an adult, it was automatic among the women in the group to walk each other to cars and make sure everyone's car started before we went our separate ways, just as one example.
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Good job parenting, LW. Your son's friends parents and people with attitudes like theirs are at least a big part of the reason parents of girls have more to worry about. Or, put another way, if parents of sons raised them to care about the safety and happiness of their friends*, regardless of gender, as opposed to the "boys will be boys" vibe I'm getting from your son's friends' parents, parents of girls would not have appreciably more to worry about than parents of boys, not least because even if some of the boys in a given group got rapey or even just harassy, some of the others would be likely to upstand instead of bystand. (I'm reminded of William Pollack's Real Boys here--- "protect your friends from harm" is or used to be a very normal "traditionally masculine" value for boys to internalize, and while it also traditionally came with horrible baggage, keeping the "help your friends be safe" part without the misogyny might be something to consider. "Friends don't let friend commit acquaintance rape" is another value to be teaching young men, along the lines of "you don't want to be that dude, and I know I sure as hell don't want the reputation of being a guy who thinks it's okay to be that dude, because girls talk to each other and warn each other about that dude", but I digress.)
*I mean, caring about the safety and happiness of friends is a good value for anyone to learn young, regardless of gender, but women do seem to get a lot more of the socialization around caring about how other people feel, whether the people in their group are enjoying themselves at a party, etc. And as for safety, when I've had jobs or other activities with late hours as an adult, it was automatic among the women in the group to walk each other to cars and make sure everyone's car started before we went our separate ways, just as one example.