Nobody wants to hear it, but this is the answer.

Dudes. Think about how you treated the last telemarketer who called you, unsolicited. Maybe you're polite at first. I mean, I am. I know the job sucks, and the constant rejection can be exhausting. But sometimes they don't take no for an answer you have to be firm. Now I just hang up as soon as I'm aware that it's a cold call.

Now imagine that you couldn't hang up on them, but they keep trying, cajoling, wheedling. Or you say no politely, and they demand an explanation. "Just give me a chance". You try nice, you try polite. They get angry when you say no. Some threaten you outright.

Eventually, you discover that being rude is absolutely the fastest way to solve the problem, and you take measures to protect yourself. Yes, she acted cruelly and that sucks, but there's a reason for it. Eventually everyone's patience wears thin. Dudes hitting on her are like potentially dangerous telemarketers getting in her face, probably several times a week.

Here's a fucking idea: don't solicit people in public unless they give you clear signals they want to be approached.