Context is key. In a bar, it might be OK. (This is not a blank cheque I'm giving you, you still need to think about a lot of things!) In the métro, I'd say yes, in almost all cases it would be unwanted. Unwanted forced interactions with strangers are harassment.

Yes, it's sad that you may lose the love of your life this way. It's sadder that many women lose their actual lives over this kind of thing.