B
burt-oh-my!
Smiling is good, grinning is good, but laughing your arse off at them is even better! Laugh at them at the same time as you kind of ignore them. Or if you must pay attention to them, stick your finger out to them, pointing at them, then laugh uproariously. Helps if there are a few of you in the car, get them to laugh too. What they want above all is to be noticed, for you to be angry, so that's exactly what you DON'T want to give them. They want you to KNOW that they are angry. If you instead don't react, treat the whole thing as just someones amusing antics, like they are a paid court jester, a clown, a children's birthday party musician, there for your personal amusement, they will be totally whipped.