There are a lot of decent men out there.
What no decent man does - ever - is makes unsolicited approaches to a lone female. They just don't do it. When they do approach us, if they receive a polite rebuff they often turn nasty, which is all the evidence we need that their intentions were nefarious in the first place.
Why the FUCK do women owe these random men our courtesy and politeness? They are not showing it to us when they accost us - always uninvited, I might add.
London is awful for it. They make a beeline. One man once asked me to tie his shoelaces for him. I stared incredulously and told him to ask a man. I've had a man (claiming to be ex-services, as if that makes a difference) approach me in a railway station at night, trying to scam me out of money for a taxi to the hospital for his 12-week pregnant wife. The wife, unsurprisingly, was nowhere to be seen. Then there was the one on the tube, who attempted to engage me in conversation whilst I was reading my book, trying to ask me my name and where I was going. 'Why? You're a stranger? Why could you possibly want that information?'
Yadder yadder. Response: 'I don't want to make conversation, thank you'.
Aggression. 'Leave me alone or I will call the transport police'.
More aggression. Not one person sharing my train tried to help. Cue me jumping off the train at the last minute just before the doors closed.
It isn't good enough. Nowadays, if I'm approached by a man in London - on average it happens at least once per visit - my go-to response is to tell them to go and ask a man before walking away as quickly as possible.
They can't really argue with that. If they do, they're showing up ill-intent and I wouldn't hesitate to report, or 'ask for Angela'.
This is the kind of risk management women have to do every day of our fucking lives. Engaging with it just encourages them, and I'm so pleased this OP didn't do this. The handmaidens who kowtow to this sort of shit, not least assume the right to 'tell off' other women for refusing to do likewise, boil my piss. But not as much as the aggressive, predatory men.