Actually, in my neck of the woods it can depending on the woman he just said hi to.
No matter how benign the approach (i.e. a simple "hi"), some women will still feel "harassed," call police and the police are obligated to take seriously unless and until it's proven that it was not harassment, which is a huge PITA for the guy NO DOUBT.
Sadly, same when a woman cries rape. By law, the police are obligated to take it seriously, conduct an investigation until it's proven it was not rape (or that it was).
I hate to say but women really do have most of the power in these types of situations.
Personally I think it's a sad day when a man can't even say "hi" to a woman without her going batshyt craze, accusing the guy of harassment or godonlyknows what else depending on what type of mood she's in that day.
Just yesterday, I was walking back to the office from lunchbreak and this random dude approached me on the street and was trying to talk to me. He wasn't rude at all nor did I feel threatened in any way. It was broad daylight with lots of people around.
I was in a decent mood so I chatted with him a bit while we walked, even though I would have preferred he go away but it was only a few more minutes till I arrived at my office.
Once back, I told my female friend/co-worker about it and SHE went freakin crazy, telling me I should have called the police!!!
I mean she was yelling at me for not calling the police right then and there even tho the guy did nothing except attempt to have a pleasant conversation with me.
Outcome: He asked for my number, told me he would like to buy me dinner, I told him thanks I'm married and that was that.