If you're not sure what they said, why assume it was something negative?
At 200 yards, it's not even clear who they were talking to.
There is always a chance that it was a mistake and we were not the intended target. I hope that is the case. However, when someone sticks their head out of a vehicle, looks directly at you and then yells at you, it's pretty easy to understand when it's negative and when it's positive. I am 99% sure it was negative and I'm 95% sure it was intended for us. My wife feels the same way. Nobody else was in the environment. It actually happened in front of the junior high, which starts school 15 minutes earlier, so no adults or kids were outside. We were the only other people that were outside in that environment. We didn't see anyone else in the car. Even if someone else was in the car, why would they stick their head out the window to talk to them.
I've been yelled at quite a bit in my life for just being outside. When I jogged outside in the evenings in grad school, it would happen probably once every 2 to 3 months. It would happen to my roommate as well who was a jogger. He had a large amount of body hair and would occasionally run without a shirt if it was hot. People would scream at him as they drove by and the most popular comment was "nice sweater"
Also while in grad school, I was doing some landscaping in my front yard and my basketball shorts got wet and was dragging. I was showing off a little bit of "plumbers crack" Some college kids stopped and screamed out the window, "crack kills" and sped off.
I had "friends" that would yell at runners on the street in high school. One time, after they drove off they realized it was one of the teachers at the high school.
Lastly, Scott Trench (CEO from biggerpockets) tells a story of when riding his bike to work, someone in a large pick-up trucks yells at him, "Sucks to be poor!" and then sped off.
I think it's a thing. Humans are weird, right?
This Nike commercial comparing skateboarding to running is also very entertaining.
https://www.youtube.com/watch?v=yKo4NI6i_EY