It is frequently claimed that women can sense the bitterness or frustration of men who vent about their dating failures online, and this keeps said men single. The giant elephant in the room whenever this is claimed is that men who are abusive, or who cheat, or who conceal any number of other objectionable behaviors obviously have no issues attracting women.

The distinction, it is then claimed, is that abusive/cheating/otherwise nefarious sexually active men have good social skills and can better conceal their feelings or intentions. I doubt that for any number of reasons, not the least of which is that many of them don't even bother concealing it. I've known utter sociopaths who harassed women online, under their real names, and were still married.

But, even if we accept that abusive men are all master manipulators, this fact remains: The only social skill required to conceal frustration and bitterness with dating is to refrain from expressing such sentiments in public. Short of that, no one can actually accurately intuit your feelings about sex and dating.

The defenses of "women can sense your toxicity" claims inevitably just boil down to incredibly vague things like "vibes." Getting a "vibe" just means that you're making an assumption. It does not mean that you can actually accurately intuit someone's feelings.

The entire "women sense toxicity" trope is just an adult equivalent of "You need to eat your vegetables, because Santa is watching!" It's condescending, and the people saying don't actually believe it, but they think it's a white lie because it may instill enough fear to get someone to do what they want.