Throw a bird to someone and they could absolutely get out and shoot you in the head. It happens. Holler at somebody for tossing trash out the window and you never know if they’re packing a Glock and having a bad day. Just let it go. It’s not worth it. Meditate or something.
Nevertheless, if you absolutely must express yourself physically and/or verbally to a moronic motorist, pedestrian or elected official, instead of the trite “fuck you” and tired middle finger try blowing them a kiss. Get creative. “Jesus loves you” is way more weird and amusing and usually gets under your foe’s skin just the right amount. You’ve been warned, however. You may be shot in the head.