Earlier quoted context omitted.
Game theory tells us the most effective strategy is matching their energy until they shift modalities. Sometimes, adults deny this truth to their own detriment because they’re “smart” or “civilized”.
Interesting, what's the game theory argument for this strategy?
The optimal strategy is signaling alliance (to receptive partners); after that, it’s reciprocating behavior.
Teenagers (and many adults) aren’t willing to ally, so we’re left with reciprocating. Until they accept being allies is a good idea.