Greetings and Peace, all
Most street fights are avoidable simply by leaving the area. One who gets involved in the situation mentioned is likely to get the worst of a fight, because they are complying with the other person's plan--falling into their OODA loop. The planner of the fight has anticipated the fight and knows exactly how they intend to proceed. To quote a movie, "Stange game, the only winning move is not to play." If forced into a fight, respond appropriately to the threat--and try to end the fight quickly. Not only are all fights not winnable, but it only takes a single person to escalate a situation. Things can turn ugly quickly.
Aggression is corruption--but children are usually not held to the same standards as adults. Shoving someone rudely is corruption. Spitting at someone is corruption. Cursing someone is corruption. Not as much corruption as killing--but corruption just the same. The key word in response to aggression is appropriateness. Throwing a fragmentation grenade at someone who threw a rock at you is not an appropriate response. In some cases, swearing out an arrest warrant for battery (if a person hit you knowingly) is an appropriate response. I did this one time--swear out a warrant rather than utilize a weapon. I'd also tried to avoid the situation, but was unable to. Turns out, the guy's father shot the assaulter in self defense (over something unrelated) before the warrant could be served. Sad story, but maybe the warrant helped the father get acquitted of all charges.
Anyway, maybe too much "narrative" here.
ALLAH knows best.