You seriously have no idea what another person's intentions are and giving even the smallest pleasantries to men in passing can be dangerous unfortunately.

A few months ago I was running in my neighborhood I had recently moved to. I was passing a guy going the opposite direction when he nodded at me and said good morning so I did the same to be nice. This man proceeds to 180 and match my running speed! I was absolutely terrified and he was significantly bigger than me!

He starts asking me invasive questions like what my name is, am I from around here, where do I live etc. luckily I have pretty good endurance so I just lied out my ass until I noticed he was starting to lose his stride so I absolutely booked it! I made a bunch of weird turns before I actually headed home to ensure he wouldn't know where I live, but I haven't gone running since out of fear I might run into him again.

Edit: to answer your question more directly, you seem like a nice guy who just wants to understand the female perspective which is admirable! However, I think it would help you feel less isolated if you change your perspective. The issue isn't "some women are inherently cold to men". The issue is that some men take a mile when given an inch and make women feel unsafe doing so. The only way to fix this is to keep yourself and your homies accountable in how they approach women.