The people who talk sh** at you from moving vehicles are all cowards. The only reason they say anything is because you cannot catch them, or they have a couple of friends. I used to work as a human sign, and people would say stuff all the time... I gave my share back... people would rarely say anything at a stop light... the two times anyone did, I got aggressive back... one dude shut up, and looked straight ahead, and never gave me a second glance, the other group saw me walking towards their vehicle, and they promptly decided to make a right turn, no signal, nothing. People do such things when they are under the impression that they cannot be made accountable for their actions: it's the craven's way.