I mean, this doesn't necessarily mean the child has bad manners if it's just a social thing. Again it's a retarded social media thing but I'm not gonna climb over some chair to beat my child into submission for just joining in a silly social thing with their friends. It's no different to when kids were doing fortnite dances at ceremonies and stuff.
I'm sure with the money this movie is making the bad guy is the producers and cinemas for not paying their staff extra now to deal with the extra work, as it should work.
I am assuming this is some Minecraft thing, and that's why kids are doing it, like you feed chickens popcorn in Minecraft or something.
the grown ass men doing this though deserve to have their ears ringing from a full force open hand slap.