Agree with this OP.
Nothing to do with sex, if you're someone who dates friends that's not what this is.
It is a really, really nasty, icky feeling - implies that if you're a single female you're desperate and at the bottom of a social hierarchy.
And once you're at the bottom of the social hierarchy, you can be kicked around and bullied socially, have no genuine support, be rejected, but be passed around every man going who shows an interest.
Obviously consenting adults can do what they like privately, no-one to be slut-shamed etc.
But we are social creatures, and if your modern tribe/community (people you call friends) are eroding your self-esteem and making it clear you are just a sexual and social resource rather than a human being, of course it feels incredibly threatening.
Its essentially Othering single women and implying they aren't really worthy, proper human beings.
Friendship or companionship or feeling part of a regular safe space or community is so important for mental wellbeing.
It's basically a passive-aggressive way of saying to a woman "you're not REALLY wanted or welcomed" .
Definitely more a power/status thing than an attraction thing.
Feels very competitive and manipulative and calculated, rather than spontaneous authentic attraction.
Often the guys who do this shit seem to feel threatened or competitive so try to set up women by making out they're trying to steal them from their partners. Get them a reputation in a workplace or network or a friendship group.
And unfortunately other women often won't support another woman if some blokes in the group start seeing her this way.
It's essentially social assassination and trying to get a woman isolated and losing her network ..,,, "she had Robert round at hers, and then Mark.. can't have her round for parties!".
Or implying they "could" have women if they wanted and all these women are begging them for commitment they wouldn't even want them if they were single.
I do agree there are OK groups and men, but predators like this try to basically stop women from trusting ok new people.
I agree it is horrific, but to any women going through this, please don't shut yourself off from new support networks as a result.
Be wary and cautious, and maybe cut back on 1-1 interactions. But there are OK people as well as toxic people.