How often do you guys have dudes picking fights with you unprovoked?

Today while leaving a doctors appointment I had two guys that looked around my age (21 years old) start yelling for my attention as I was walking to my car so I looked up and they started talking shit saying I was a pussy and to come throw down all I did was laugh at them at first not thinking they were dead serious but all that did was piss them off more I continued onto my car as they yelled off as many insults they could and hopped in my car and left but now I can’t stop thinking about it and how maybe I should’ve done something different I’ve just never had guys try to start a street fight out of nowhere I literally didn’t even see them until I looked over to the sidewalk when leaving my doctors office just feel like I could’ve stuck up for myself better they just looked trashy and were walking around looking for fights so I kept it moving but now can’t stop replaying it in my head.