The thing is, normal human social interaction has unspoken rules. Some of these are quite firm, like “don’t touch strangers” or “shake hands when being introduced in professional contexts”. Others are more flexible. Like speaking to strangers in non-social spaces, like sidewalks or public transit stations. You may very well engage in a conversation with a stranger in a train station, but there’s some pretty expected topics for this conversation, like the weather, where you’re both going, if someone’s wearing a shirt with a logo of something you’re familiar with or like, etc. The conversation may develop beyond that, but that’s the accepted start (and general ending, unless the other person is demonstrating through their behavior that they’re really enjoying speaking with you) to the conversation. And when you’re trying to talk to strangers you always have to be willing to accept the possibility that they just aren’t interested and that’s okay. It’s quite outside the general rules of normal social interaction to offer strangers gifts, and frankly this rule is generally only broken by thirsty dudes (or people who are trying to get money from you). When women say “don’t talk to me in public” they generally don’t mean “I hate when people make polite small talk with me”, they mean “I hate when men hit on me when i’m waiting for a train”. They’re denouncing abnormal social interaction.