Is it unexpected? If they were a guy then the comment is much creepier than for a girl. Which is what I incorrectly assumed and I guess lots of others did too.

So many girls have to deal with people leering whenever they’re out and about, seems more likely that some random who keeps glancing over would be one of those (even if your intentions were well meaning). The issue is really about deciding someone is vulnerable I guess, if they’re bleeding out in a deserted alley then obviously help, but if they’re enjoying a night out and haven’t asked for help then leave them to it.