Yes, of course they know, and of course some of them do it on purpose. I'm surprised this is news to anyone over the age of about 12 tbh. The point is the fear it will obviously engender and the feeling of power and control that bestows. In that sense it's a form of bullying and confronting him, albeit wordlessly, was an effective strategy, although not necessarily a sensible one. But sometimes your anger is stronger than your fear and imo that's a powerful weapon in this whole issue, and we need to discover how best to harness our anger to bring about culture change. I've been experiencing and witnessing behaviour like this, and other related things, for nearly half a century now and I'm absolutely fucking sick of it, and more ready for confrontation and change than I have ever been.
And no, it's 'not all men', but it's a substantial minority of them and is very normalised behaviour. I would say the number of men who actively avoid creating a sense of threat is also a clear minority, and the overwhelming majority of men, however witlessly well-meaning they may be, have just never thought about it one way or the other because they don't have to, which is half the problem. Just as all white people, even if not actively racist, benefit from a society in which whiteness confers privilege, so all men benefit from the status quo in a misogynist society. It's not good enough that so many of them plead ignorance, still less so that women do it for them.
There is a lot of talk about how we should educate our partners and sons, which imo is just another way of saying 'this is your problem, you sort it out'. None of what is so offensive about toxic and predatory male behaviour is complicated to understand. Just as the OP turned around and stood her ground, I think it's really time women simply said enough, this has to stop, and demanded the legislative and cultural change that's so clearly needed. Following Sarah Everard's murder, I think society is having a 'moment' in which that might be possible, but it's important not to get fobbed off with empty assurances about non-compulsory crime categorisation schemes and whatnot, and to absolutely reject the namalt crap. All men need to start taking responsibility for the way they think and talk about women, and how they act towards them in both private and public situations.