Yell and fight in public.
The only thing worse than a child acting out in public is a woman acting out in public. Everyone already assumes it’s the guy’s fault and just about anything he does looks bad. He could run, but then he looks like an idiot. He could be the calm and collective one, but then you’ll probably just get louder or mush him. He could yell back, but then he just looks like a bigger jerk. Caught between a rock and a hard place, he might as well just put his balls on a platter.